#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main() {
	int ans = 0, t, n, i, j;
	int arr[2000001];
	double a;
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%lf %d", &a, &t);
		for (int j = 1; j <= t; j++) {
			arr[(int)(j * t)] = ~arr[(int)(j * t)];
		}
	}
	for (int i = 1; ; i++) {
		if (arr[i] == 1)
			ans = i;
		break;
	}
	printf("%d", ans);
}

大佬们看看这有什么问题