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


int main() {
    int N;
    cin >> N;
    string path;
    cin >> path;
    int a = 0;
    int downhill = 0;
    for (int i= 0; i < N; i++)
        {if (path[i] == 'U'){a = a + 1;}
         if (path [i] == 'D'){a = a - 1;}
         if ((path[i] == 'U') && (a == 0)){downhill = downhill +1;}
        }
    cout << downhill;
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}