#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 n,m=0,c=0;
    cin>>n;
    char v[n];
    scanf("%s",v);
    for(int i = 0;i<n;i++){
        if(v[i]=='U')
            m++;
        else if(v[i]=='D')
            m--;
        if((m==0)&&(v[i]=='U'))
            c++;
    }
    
    cout<<c;
    return 0;
}