#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#define MAX 100000
int main() {

    long int n;
    char car;

    scanf("%ld",&n);
    long int i;
    long int indice=0;
    long int downhills=0;
    scanf("%c",&car);
    for(i=0;i<n;i++){
        scanf("%c",&car);
        //printf("%c****\n",car);
        if(car=='U'){
            //printf("\n*%d*\n",indice);
            indice++;
            //printf("*%d*\n",indice);
            if(indice==0)
                downhills++;
        }
        else{
            //printf("blem\n");
            indice--;
        }
    }
    printf("%ld",downhills);
}