#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
#define lli long long int


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    lli n;
    char a[1000000];
    int upDown = 0;
    bool done = false;
    lli count = 0;
    cin >> n;
    cin >> a;
    for(lli i = 0; i < n; i++){
        if(a[i] == 'U'){
            upDown++;
        }
        else{
            upDown--;
        }
        
        if(upDown < 0){
            if(!done)
                count++;
            done = true;
        }
        if(upDown >= 0){
            done = false;
        }
    }
    cout << count;
    return 0;
}