1239

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <stdio.h>

using namespace std;

int main() {
    ifstream fin("input.txt");
    ofstream fout("output.txt");

    int n;
    cin >> n;
    vector<vector<double>> dp(n+1, vector<double>(3));
    dp[0][0] = 100;
    double dol, eu;
    for (int i = 1; i <= n; i++) {
        cin >> dol >> eu;
        dp[i][0] = max(dp[i - 1][0], max(dp[i - 1][1] * dol, dp[i - 1][2] * eu));
        dp[i][1] = max(dp[i][0] / dol, dp[i-1][1]);
        dp[i][2] = max(dp[i][0] / eu, dp[i - 1][2]);
    }
    /*cout.precision(2);
    cout << max(dp[n][0], max(dp[n][1] * dol, dp[n][2] * eu)) << endl;*/
    printf("%.2f", max(dp[n][0], max(dp[n][1] * dol, dp[n][2] * eu)));

    fin.close();
    fout.close();
    return 0;
}