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


int main() {
    int n, count = 0, down = 0;
    char c;
    
    scanf("%d\n", &n);
    
    for (int i = 0; i < n; i++) {
        scanf("%c", &c);
        
        if (down == 0 && c == 'D') count++;
        
        if (c == 'U') {
            down++;
        } else {
            down--;
        }        
        
    }
    
    printf("%d", count);
    
    return 0;
}