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


int main() {
    int n,i=0,sum=0,count=0;
    cin>>n;
    char str[n];
    cin>>str;
    while(str[i]){
        if(str[i]=='U'){
            sum++;
            if(sum==0)count++;
        }
        else sum--;
        i++;
    }
    cout<<count;
    return 0;
}