#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;
    char steps[n];
    int valleys=0;
    int height[n+2];
    height[0] = 0;
    height[n+1] = 0;
    for(int i=0;i<n;i++) {
        cin >> steps[i];
        if (steps[i]=='U') {
            height[i+1] = height[i]+1;
        } else if (steps[i]=='D') {
            height[i+1] = height[i]-1;
        }
    }
    for(int i=0;i<n;i++) {
        if (height[i]==0 && steps[i]=='D') {
            valleys++;
        }
    }
    cout << valleys << endl;
    return 0;
}