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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    long long n,c=0,d=0,i;
    cin>>n;
    char a[1000000];
    for(i=0;i<n;i++)
        cin>>a[i];
    for(i=0;i<n;i++)
        {
          if(a[i]=='U')
              c++;
           else
               c--;
        if(c==0 && a[i]=='U')
            d++;
        }
    cout<<d;
    return 0;
}