#include <iostream>
#include <cstdio>
#include <ctime>
#include <cstdlib>
#include <cmath>
using namespace std;

const int N = 55;

int n, X[N], Y[N], m, p[N];

int ans = 0, sum;

int inline get() {
	int res = sum;
	for (int i = 1; i < m; i++)
		if (X[p[i]] == 10) res += X[p[i + 1]] + Y[p[i + 1]];
		else if (X[p[i]] + Y[p[i]] == 10) res += X[p[i + 1]]; 
	ans = max(ans, res);
	return res;
}

double inline rd() {
	return (double)rand() / RAND_MAX;
}

void inline simulateAnneal() {
	int v = get();
	for (double t = 1e4; t > 1e-4; t *= 0.99) {
		int a = rand() % m + 1, b = rand() % m + 1;
		swap(p[a], p[b]);
		if (n + (X[p[n]] == 10) == m) {
			int nv = get();
			if (exp(-((double)v - nv) / t) <= rd()) swap(p[a], p[b]); 
			else v = nv;
		} else swap(p[a], p[b]);
	}
}

int main() {
	srand(time(0)); double s = clock();
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) scanf("%d%d", X + i, Y + i);
	if (X[n] == 10) scanf("%d%d", X + n + 1, Y + n + 1);
	m = n + (X[n] == 10);
	for (int i = 1; i <= m; i++) sum += X[i] + Y[i], p[i] = i;
	for (int i = 0; i < 30; i++) simulateAnneal();
	printf("%d", ans);
	return 0;
}