#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    char arr[n];
    cin>>arr;
    int len = strlen(arr);
    int count = 0;
    int sum =0;
    for(int i =0;i<len;i++){
        //cout<<sum<<" ";
        if(arr[i] == 'U'){
            sum = sum +1;
            if(sum ==0)
                count++;
        }
        else
            sum = sum - 1;
    }
    cout<<count<<endl;
    return 0;
}