#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int num, res, hei, cnt;
char c;

int main() 
{
    cin >> num;
    for(int i = 1; i <= num; i++) {
        cin >> c;
        if(c == 'U') {
            hei++;
            if(hei == 0) res++;
        }
        if(c == 'D') hei--;
    }
    cout <<res;
    return 0;
}