#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
  /*using namespace std;
#include<stdio.h>
int main()
{
    
        int n;
        cin>>n;
       // n=2*n;
        int arr[26]={0};
        for(int i=0;i<26;i++)	arr[i]=i+97;

        for(int i=0;i<n;i++)  
        {
            char a,b;
            cin>>a>>b;
            if(a<97)    a=a+32;
            if(b<97)    b=b+32;
            arr[a-'a']=b;
            arr[b-'a']=a;
        }
        */

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    long long int s=0;
    int t;
    cin>>t;
    /*using namespace std;
#include<stdio.h>
int main()
{
    
        int n;
        cin>>n;
       // n=2*n;
        int arr[26]={0};
        for(int i=0;i<26;i++)	arr[i]=i+97;

        for(int i=0;i<n;i++)  
        {
            char a,b;
            cin>>a>>b;
            if(a<97)    a=a+32;
            if(b<97)    b=b+32;
            arr[a-'a']=b;
            arr[b-'a']=a;
        }
        */
    int a,b,c,d;
    cin>>a>>b;
    while(t--)
    {
        cin>>a>>b>>c>>d;
        s+=d;
    }
    cout<<s<<endl;
    return 0;
    
}
/*using namespace std;
#include<stdio.h>
int main()
{
    
        int n;
        cin>>n;
       // n=2*n;
        int arr[26]={0};
        for(int i=0;i<26;i++)	arr[i]=i+97;

        for(int i=0;i<n;i++)  
        {
            char a,b;
            cin>>a>>b;
            if(a<97)    a=a+32;
            if(b<97)    b=b+32;
            arr[a-'a']=b;
            arr[b-'a']=a;
        }
        
    
        string str;
        cin>>str;
        
        for(int i=0;i<str.size();i++)
        {
            char ch=str[i];
            
            if(ch<97)        {ch=arr[ch-'A']-32;  }    
            else	         ch=arr[ch-'a'];

            str[i]=ch;
        }
        
        cout<<str<<endl;
    
    return 0;
}*using namespace std;
#include<stdio.h>
int main()
{
    
        int n;
        cin>>n;
       // n=2*n;
        int arr[26]={0};
        for(int i=0;i<26;i++)	arr[i]=i+97;

        for(int i=0;i<n;i++)  
        {
            char a,b;
            cin>>a>>b;
            if(a<97)    a=a+32;
            if(b<97)    b=b+32;
            arr[a-'a']=b;
            arr[b-'a']=a;
        }
        
    
        string str;
        cin>>str;
        
        for(int i=0;i<str.size();i++)
        {
            char ch=str[i];
            
            if(ch<97)        {ch=arr[ch-'A']-32;  }    
            else	         ch=arr[ch-'a'];

            str[i]=ch;
        }
        
        cout<<str<<endl;
    
    return 0;
}
/*using namespace std;
#include<stdio.h>
int main()
{
    
        int n;
        cin>>n;
       // n=2*n;
        int arr[26]={0};
        for(int i=0;i<26;i++)	arr[i]=i+97;

        for(int i=0;i<n;i++)  
        {
            char a,b;
            cin>>a>>b;
            if(a<97)    a=a+32;
            if(b<97)    b=b+32;
            arr[a-'a']=b;
            arr[b-'a']=a;
        }
        
    
        string str;
        cin>>str;
        
        for(int i=0;i<str.size();i++)
        {
            char ch=str[i];
            
            if(ch<97)        {ch=arr[ch-'A']-32;  }    
            else	         ch=arr[ch-'a'];

            str[i]=ch;
        }
        
        cout<<str<<endl;
    
    return 0;
}*/