#include <bits/stdc++.h>
using namespace std;
#define forl(i,x,y) for(int i=x;i<y;++i)
int main() {
    int T;scanf("%d",&T);
    int c = 0, num = 0, curr = 0, prev = 0;
    string s; cin >> s;
    forl(i,0,s.length()) {
        if (s.at(i) == 'U') {c++;}
        else {c--;}

        if (c < 0) {curr = -1;}
        else if (c > 0) {curr = 1;}
        else {curr = 0;}

        if (curr == -1 && prev == 0) {num++;}
        prev = curr;
    }
    printf("%d",num);
    return 0;
}