#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 test, sum = 0, count = 0;
    char c;
    bool flag = 1;
    cin >> test;
    c = getchar();
    while(test--)
    {
        c = getchar();
        if(c == 'U')
            ++sum;
        else if(c == 'D')
            --sum;
        if(sum == 0)
            flag = 1;
        else if(flag && sum < 0)
        {
            ++count;
            flag = 0;
        }
    }
    printf("%d", count);
    return 0;
}