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


int main() {

	int N;    
	string steps;
	int vallies = 0;
	bool isValley = false;
	int c = 0;	
	

	cin >> N;
	cin >> steps;
	
	for(int i = 0; i < steps.size(); i ++){
		
		if(c < 0){

			isValley = true;

		}

		if(steps[i] == 'U'){
	
			c ++;

		}else if(steps[i] == 'D'){

			c --;

		}

		if(c == 0){

			if(isValley){
				vallies ++;
				isValley = false;
			}

		}

	}

	cout << vallies;

    return 0;
}