{}
const n = parseInt(prompt());
const rate = Array.from({ length: n }, () => prompt().split(' ').map(Number));
const rub = new Array(n).fill(0);
const usd = new Array(n).fill(0);
const eur = new Array(n).fill(0);
rub[0] = 100.0;
usd[0] = rub[0] / rate[0][0];
eur[0] = rub[0] / rate[0][1];
for (let i = 1; i < n; i++) {
rub[i] = Math.max(usd[i - 1] * rate[i][0], eur[i - 1] * rate[i][1], rub[i - 1]);
usd[i] = Math.max(rub[i - 1] / rate[i][0], rub[i] / rate[i][0], usd[i - 1]);
eur[i] = Math.max(rub[i - 1] / rate[i][1], rub[i] / rate[i][1], eur[i - 1]);
}
console.log(rub[n - 1].toFixed(2));