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

using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using vi = vector<int>;
using vl = vector<ll>;
ld EPS = 1e-12;
int INF = numeric_limits<int>::max() / 2;
int MOD = 1e9 + 7;
#define rep(i,n) for(int i = 0; i < n; i++)
#define all(obj) (obj).begin(), (obj).end()
#define debug(x) cerr << #x << ": " << x << '\n'
 
int main(){
    int n;
    string s;
    cin >> n >> s;
    int ans = 0;
    for(int i = 0; i < n; i++){
        for(int dis = 1; dis < n; dis++){
            if(i+dis>=n) continue;
            if(s[i] == 'U' && s[i+dis] == 'M' && s[i+dis*2] == 'G') ans++;
        }
    }
    cout << ans <<'\n';
    return 0;
}