#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,cnt=0,v=0,up;
    scanf("%d",&n);
    char str[n];
    //int s[n];
    scanf("%s",str);
    for(int i=0;i<n;i++)
        {
        if(str[i]=='U'){
            cnt++;
            up=1;
            //s[i]=cnt;
        }
        else{
            cnt--;
            up=0;
            //s[i]=cnt;
        }
        if(cnt==0 && up==1)
            v++;
            
    }
    printf("%d",v);
        
    return 0;
}