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


int main() {
    int n;
    cin>>n;
    char a[n];
    for(int i=0;i<n;i++)
        cin>>a[i];
    int position=0;
    int valleys,mountains;
    
    for(int i = 0; i < n; i++){
    if(a[i] == 'U'){
        position++;
        if(position == 0){
            valleys++;
        }
    }
    else if(a[i] == 'D'){
        position--;
        if(position == 0){
            mountains++;
        }
    }  
    }
    cout<<valleys;
    return 0;
}