#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,x=1;
    scanf("%d\n",&n);
    char str[10000000];
    gets(str);
    int sum;
   // printf("%c",str[0]);
  //  if(str[0]=='U')
        //sum=1;
    sum=0;
   // printf("%d\n",sum);
    int count=0,i;
    for(i=0;i<n;i++)
        {
       
       if(str[i]=='U'){
           sum++;
           if(sum==0)
               x=1;
       }
        else{
            
            if(sum==0&&x==1){
                count++;
                x=0;
            }
            sum--;
        }
    }
    printf("%d",count);/* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}