#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);
    int count=0;
    int sealevel=0;
    int level = 0;
    
    for(int i = 0; i<N; i++){
        char direction = getchar();
        fflush(stdin);
        
        if(direction == 'U'){
            level+=1;
            if(level>0)
                sealevel=1;
            else if(level==0)
                sealevel=0;

        }
            
        else if(direction == 'D')
        {
            if(level==0 && sealevel==0){
                count++;
            }
            level-=1;
            if(level<0)
                sealevel=-1;
            else if(level==0)
                sealevel=0;
        }
 
    }
    printf("%d",count);
    return 0;
}