#include<iostream>
#include <stdio.h>
#include<algorithm>

using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define pb push_back
#define mp make_pair
typedef long long ll;
int main()
{
    int n;
	scanf("%d\n",&n);
	char c;
	int sum=0,ans=0;
	for(int i=0;i<n;i++)
	{
		scanf("%c",&c);
		if(sum==0&&c=='D') ans++;
		if(c=='U') sum++;
		if(c=='D') sum--;
	}
	
	printf("%d\n",ans);
	
	return 0;
}