#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 */   
    int n;
    cin>>n;
    int start = 0;
    int vals = 0;
    for(int i = 0; i < n; i++)
    {
        char x;
        cin>>x;
        if(x == 'U')
        {
            if(start == -1)
                vals++;
            start++;
        }
        else
            start--;
    }
    cout<<vals<<endl;
    return 0;
}