#include<stdio.h>
int main(){
    
    int seaLevel =0, uCount=0, v=0,limit,valley=0,i;
    char step;
    scanf("%d",&limit);
    for(i=0;i<=limit;i++){
        
        scanf("%c",&step);
       
        
        if(step == 'U')
            {
            v = uCount;
            uCount++;
             }
        else if(step == 'D'){
            
            v=uCount;
            uCount--;
        }
        if(uCount==0 && v<0)
            valley++;
        
    }
    printf("%d",valley);
    
    
    
}