#include<iostream>
#include<math.h>
#include<iomanip>
using namespace std;
const int N = 2000010;
bool open[N];
int main() {
	int n;
	double a, t;
	cin >> n;
	while (n > 0) {
		n--;
		cin >> a >> t;
		for (size_t i = 1; i <= N; i++) {
			for (size_t j = 1; j <= t; j++) {
				if (i == floor(a * j)) {
					if (open[i]) {
						open[i] = false;
					}
					else {
						open[i] = true;
					}
				}
			}
		}
	}
	for (size_t i = 1; i <= N; i++) {
		if (open[i]) {
			printf("%d", i);
		}
	}
	return 0;
}