#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 sea = 0, counter = 0;
    int n;
    cin >> n ;
    string path;
    cin>>path;
    int i;
    for (i=0; i<n; i++){
        if(path[i] == 'U'){
            sea ++ ;
            if(sea == 0){
                counter ++;
            }
        }
        else
            sea--;
    }
    cout<<counter;
    return 0;
}