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


int main() {
    int count=0,prev=0;
    int n,x=0; 
    cin>>n;
    char s[n];
    for(int i=0;i<n;i++)
    {
        cin>>s[i]; }
    for(int i=0;i<n;i++)
    {
        
        if(s[i]=='U') count+=1;
        else count-=1;
        if(prev==-1 && count==0)
            x++;
        prev=count;
    }
    cout<<x;
    return 0;
}