#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    char l;
    int no,opt;
    long int t;
    cin>>no;
    t=0;
    opt=0;
    for(int i=0;i<no;i++)
    {   
        cin>>l;
        if(t==0 && l=='D')
            {
            opt+=1;
        }
        if(l=='U')
        {   
            t+=1;
        }
        else if(l=='D')
        {   
            t-=1;
        }
        
    }
    cout<<opt;
    return 0;
}