#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 i,k=0,n,count=0;
    cin>>n;
    char arr[n];
    for(i=0;i<n;i++)
        {
        cin>>arr[i];
    }
    for(i=0;i<n;i++)
        {
        if(arr[i]=='U')
            {
            k++;
            if(k==0)
            {
            count++;
            }
        }
        else if(arr[i]=='D')
            {
            k--;
        }
     
    }
    cout<<count; 
    
    return 0;
}