#include<iostream>
#include<cstdio>
using namespace std;

int main(){
	int i,n,count=0;
	char j;
	cin>>n;
	int a[n];
	for(i=0;i<n;i++){
		cin>>j;
		if(j=='U')
			count++;
		else
			count--;
		a[i]=count;
	}
	for(i=1,count=0;i<n;i++){
		while(a[i]!=0)
		i++;
		if(a[i-1]==-1)
		count++;
	}
	cout<<count;
	return 0;
}