#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int N;
    scanf("%d\n", &N);
    char step;
    int level = 0;
    int valleys = 0;
    for(int i = 0; i < N; i++){
        scanf("%c",&step);
        if(step=='U'){
            if(level++<0 && level==0){
                valleys++;
            }
        }
        else{
            level--;
        }
    }
    printf("%d",valleys);
    return 0;
}