#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];
    for(int i=0; i<n; i++){
        cin>>steps[i];
    }
    int counter=0, ez=0; int k;
    for(int i=0; i<n; i++){
            k=counter;
        if(steps[i]=='U'){
            counter++; 
        }
        else if(steps[i]=='D'){
            counter--;
        }
        if(counter==0 && k<0){
            ez++;
        }
    }
    cout<< ez <<endl;
    return 0;
}