#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>

/* I/O Commands */
#define si(n) scanf("%d", &n)
#define sl(n) scanf("%lld", &n)
#define ss(n) scanf(" %[^\n]", n)
#define slf(n) scanf("%lf", &n)
#define sc(n) scanf("%c", &n)
#define pi(n) printf("%d", n)
#define pc(n) printf("%c", n)
#define pl(n) printf("%lld", n)
#define plf(n) printf("%0.1lf", n)
#define ps printf(" ")
#define pe printf("\n")

/* Containers */
#define ll long long
#define vi vector<int>
#define vl vector<ll>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vpii vector<pii>
#define vpll vector<pll>
#define sti set<int>
#define stpii set<pii>
#define mii map<int,int>
#define mci map<char,int>
#define msi map<string,int>
#define mll map<ll,ll>

/* Containers element */
#define fr front
#define pb push_back
#define pob pop_back
#define pof pop_front
#define mp make_pair
#define iter(it,q) for(auto it=q.begin(); it!=q.end(); it++)
#define riter(rit,q) for(auto rit=q.crbegin(); rit!=q.crend(); rit++)

/* Constants */
#define INF 1000000000000000000
#define MOD 1000000007
#define PI 3.14159265358979323846
#define mod(a) ((a)%MOD)

using namespace std;

int main() {
	//freopen("in.txt", "r", stdin);
	int n, i, ans = 0, up = 0, down = 0;
	cin >> n;
	string s;
	cin >> s;
	for (i = 0; i < n; i++) {
		if (s[i] == 'D')
			down++;
		else
			up++;
		if (s[i] == 'U' && down == up)
			ans++;
	}
	pi(ans);
	pe;
	return 0;
}