#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 count=0;
    int n;
    cin>>n;
    string str;
    cin>>str;
    
    int plus=0;
    for(int i=0;i<n;i++)
        {
        if(str[i]=='U')
            {
            count++;
            if(count==0)
                plus++;}
        if(str[i]=='D')
            count--;
       
    }
    cout<<plus;
    return 0;
}