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


int main() {
    
    int n; 
    cin >> n;
    string x; 
    cin >> x; 
  
    long long int fSum = 0; 
    long long int sum = 0; 
    for(string::iterator it = x.begin(); it != x.end(); it++)
        {
        
        if(*it == 'U')
        {
         sum++;    
         if(sum == 0)
           fSum++; 
        }
        else if(*it == 'D')
            {
            sum--;
            
                
        }
    }
    cout << fSum << endl; 
    
    return 0;
}