#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 */   
    int n,level=0,sealevel=0,vally=0;
    cin>>n;
    char s[1000000];//=new char[1000000];
    for(int i=0;i<n;i++)
        cin>>s[i];
            for(int i=0;i<n;i++)
            {
            if(level==sealevel && s[i]=='D')
                vally++;
            if(s[i]=='U')
                level++;
            else if(s[i]=='D')
                level--;
        }

    cout<<vally;
    return 0;
}