#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,n,start=0,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')
        {
            count++;
            if(count==0)
            {
                start++;
            }
        }
        else if(arr[i]=='D')
            {
            count--;
        }
    }
    cout<<start;
    return 0;
}