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


int main() {
    int n;
    cin>>n;
    string s;
    cin>>s;
    int val=0;
    int direction=0;
    int mount=0;
    int valley=0;
    for(int i=0;i<s.length();i++){
        if(s[i]=='U'){
            val++;
        }
        else{
            val--;
        }
        if(direction==0)
        {
           direction=val;    
        }
        if(val==0){
            if(direction>0) mount++;
            else valley++;
            direction=0;
        }
    }
    cout<<valley;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}