import std.stdio,
       std.conv,
       std.string,
       std.range,
       std.math,
       std.bigint,
       std.algorithm;

void main()
{
    BigInt[] N, K;
    foreach (line; stdin.byLine)
    {
        auto input = line.split;
        N ~= BigInt(input[0]);
        K ~= BigInt(input[1]);
    }

    500.writeln;
}