#include<bits/stdc++.h>
using namespace std;
const int N = 1e6 + 7;
int n,sm,i,f1,ans,f;
char s[N];
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    scanf("%d%s",&n,s);
    for(i = 0 ; i < n ; i++)
        { 
          sm = sm + (s[i] == 'U' ? 1 : -1);
          if( sm == 0 && s[i] == 'U') ans++;
    }
    printf("%d",ans);
    return 0;
}