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


int main() {
    int n;
    cin>>n;
    int base=0;
    int count=0;
    while(n--)
        {
        char c;
        cin>>c;
        if(c=='U')
            base++;
        if(c=='D')
            base--;
        if(c=='U'&& base==0)
            count++;
    }
    cout<<count;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}