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


int main() {
    int count=0, i, n, valley=0;
    char string[20];
    do {
        cin>>n;
    }while (n<2 || n>1000000);

    cout<<
    for (i=0; i<steps.length(); i++){
        if(steps.charAt(i) == 'U') {
            count++;
            if (count == 0)
                valley++;
        }
        if(steps.charAt(i) == 'D')
            count--;

    }
    cout<<valley;
}

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */