#include <iostream>
using namespace std;

int main() {
	int n,count=0,valley=0;
	cin >> n;
	bool flag=true;
	string str;
	cin >> str;
	for(int i=0;i<n;i++){
		if(str[i]=='U'){
			count++;
			flag=true;
		}
		else if(str[i]=='D'){
			count--;
			flag=false;
		}
		if((count==0)&&(flag==true)){
			valley++;
		}
	}
	cout << valley;
	return 0;
}