#include <bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;

int main()
{
	long l,res=0,d=0;
	scanf("%ld",&l);
	string s;
	cin>>s;
	for (long i=0; i<s.length(); ++i) 
	{
		d+=s[i]=='U'?1:-1;
		if (d==0 && s[i]=='U') ++res;
	}
	printf("%ld",res);
}