#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;

const ld EPS = 0.0000001;
int n;
vector<ld> t, d;

main() {
#ifdef ONPC
	freopen("a.in", "r", stdin);
#endif
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> n;
	for (int i = 1; i <= n; ++i) {
		char c;
		ld x;
		cin >> c >> x;
		if (c == 'T') t.push_back(x);
		else if (x < 1000) d.push_back(x);
	}
	sort(t.begin(), t.end());
	sort(d.begin(), d.end());
	reverse(t.begin(), t.end());
	reverse(d.begin(), d.end());
	ld ans = 0;
	ld speed = 1;
	ld cur = 0;
	while(cur < 1000) {
		ld tt = 1e18 + 7, tu = 1e18 + 7;
		if (t.size() != 0) tt = t.back() - ans;
		if (d.size() != 0) tu = (d.back() - cur) / ((ld)1 / speed);
		if ((t.size() == 0 && d.size() == 0) || (d.size() == 0 && ((ld)1000 - cur) / ((ld)1 / speed) < tt)) {
			ans += ((ld)1000 - cur) / ((ld)1 / speed);
			//cout << '3';
			break;
		}
		if (tu < tt) {
			ans += (d.back() - cur) / ((ld)1 / speed);
			++speed;
			cur = d.back();
			d.pop_back();
			//cout << '1' << ' ' << cur << ' ' << ans << '\n';
		} else {
			ans = t.back();
			cur += ((ld)1 / speed) * tt;
			++speed;
			t.pop_back();
			//cout << '2' << ' ' << cur << ' ' << ans << '\n';
		}
	}
	//cout << '\n';
	//cout << fixed << setprecision(9) << ans << '\n';
	cout << (ll)(ans + 0.5) << '\n';
	return 0;
}