#include<bits/stdc++.h>
using namespace std;

#define max(a,b) (a)>(b)?(a):(b)
#define min(a,b) (a)>(b)?(b):(a)

#define rep(i,a,b) for(i=a;i<b;i++)
#define f first
#define s second
#define sqr(a) (a)*(a)
#define Pi 3.141592653589793
#define MOD 1000000007

// For i/o
#define sd1(a) scanf("%d",&a)
#define sd2(a,b) scanf("%d %d",&a,&b)
#define sd3(a,b,c) scanf("%d%d%d",&a,&b,&c)
#define sf scanf
#define pf printf

// For debugging
#define deb(a) printf("deb%d\n",a)

int i,j;

int main()
{
	int n;
	sd1(n);
	char ch[1000006];
	sf("%s",ch);
	long long int prev,cnt = 0,ans=0;
	rep(i,0,n)
	{
		prev = cnt;
		if(ch[i] == 'U')
			cnt += 1;
		else
			cnt -= 1;
		if(cnt == 0 && prev == -1)
			ans += 1;
	}
	pf("%lld\n",ans);
	return 0;
}