#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;
    char v[1000002];
    cin>>n;
    cin>>v;
    int count=0,tot=0;
    for(int i=0;i<n;i++){
        if(v[i]=='U')
            count--;
        else if(v[i]=='D')
            count++;
         if(count==0 && v[i]=='U')
            tot++;
    }
        cout<<tot<<endl;
    return 0;
}