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

int main() {

    long int n,i,up=0,down=0,count=0;
    scanf("%ld",&n);
    char str[n];
    scanf("%s",str);
    for(i=0;i<n;i++)
        {
        if(str[i]=='U')
           up++;
            
        else 
            down++;
        if(up==down && up!=0 &&str[i]=='U')
            {
            count++;
            up=0;
            down=0;
        }
    }
    printf("%ld",count);
}