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

int main() {
    int steps; cin >> steps;
    string s; cin >> s; 
    vector<int> h(steps+1, 0);
    for(int i=1;i<steps+1;i++){
        if(s[i-1]=='U') h[i] = h[i-1]+1;
        else h[i] = h[i-1]-1;
    }
    auto v=0;
    for(int i=1;i<h.size();i++){
        if(h[i-1]<0 && h[i]==0) v++;
    }
    cout << v << endl ;

    return 0;
}