#include using namespace std; #define rep(i,n) REP(i,0,n) #define REP(i,s,e) for(int i=(s); i<(int)(e); i++) #define repr(i, n) REPR(i, n, 0) #define REPR(i, s, e) for(int i=(int)(s-1); i>=(int)(e); i--) #define pb push_back #define all(r) r.begin(),r.end() #define rall(r) r.rbegin(),r.rend() #define fi first #define se second typedef long long ll; typedef vector vi; typedef vector vl; typedef pair pii; typedef pair pll; const int INF = 1e9; const ll MOD = 1e9 + 7; double EPS = 1e-8; int main(){ int n; string s; cin >> n >> s; int ans = 0; REP(j, 1, n-1) if(s[j] == 'M') { REP(d, 1, n+1) { int i = j - d, k = j + d; if(i < 0 || k >= n) break; if(s[i] == 'U' && s[k] == 'G') ++ans; } } cout << ans << endl; return 0; }