#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,c=0,flag=0,v=0;
    char m;
    scanf("%d",&n);
    for(int i=0;i<n+1;i++){
        scanf("%c",&m);
        if(m=='U'){
            c++;
            if(flag==1&&c==0){
                flag=0;
                v++;
            }
        }
        if(m=='D'){
            c--;
            if(c==-1){
                flag=1;
            }
        }
    }
    printf("%d",v);
    return 0;
}