#include "testlib.h"
#include <cassert>

const int MIN_N = 1;
const int MAX_N = 500;
const int SUM_N = 500;

const int MIN_K = 1;
const int MAX_K = 20;

int main(int argc, char** argv) {
    registerValidation(argc, argv);
    const int t = inf.readInt(MIN_N, MAX_N, "T");
    inf.readEoln();
    int sum = 0;
    for (int i = 0; i < t; ++i)
    {
        const int n = inf.readInt(MIN_N, MAX_N);
        inf.readSpace();
        const int k = inf.readInt(MIN_K, MAX_K);
        inf.readEoln();
        sum += n;
        assert(sum <= SUM_N);
    }
    inf.readEof();
    return 0;
}