#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 */  
    long n,count=0,vcount=0;
    char c[1000000];
    cin>>n;
    cin>>c;
    for(long i=0;c[i]!='\0';i++){
        if(c[i]=='U'|| c[i]=='u'){
            count++;
            if(count==0){
                vcount++;
            }
        }
        if(c[i]=='D'||c[i]=='d'){
            count--;
        }
    }
    cout<<vcount;
    return 0;
}