#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;
    scanf("%d",&n);
    char arr[n];
    int i;
    scanf("\n %c",&arr[0]);
    for(i=1;i<n;i++)
        {
        scanf("%c",&arr[i]);
    }
    int sea =0;
    int valley =0;
    for(i=0;i<n;i++)
        {
        if(arr[i]=='D')
            {
            sea = sea-1;
        }
        else if(arr[i]=='U')
            {
            sea =sea+1;
        }
       if(sea == 0 && arr[i]=='U')
           {
           valley++;
       }
    }
    printf("%d",valley);
    return 0;
}