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


int main() {
    int n,count=0,v=0;
    cin>>n;
    char a[n];
    for(int i=0;i<n;i++)
        {
        cin>>a[i];
        if(a[i]=='U'){
            count++;
            if(count==0)v++;
        }
        else count--;
        
    }
    cout<<v;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}