#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,sum=0,b[2],count=0,i=0;
    scanf("%d",&n);
    char a[n];
   
    scanf("%s",a);
    while(a[i]!='\0')
        {
        if(a[i]=='U')
            sum++;
        
        else sum--;
    if(sum==-1)
     b[0]=1;
    if(b[0]==1 && sum==0)
        {
        count++;
        b[0]=0;
        b[1]=0;
    }
    i++;
    }
    printf("%d",count);
    return 0;
}