代码如下

#include<bits/stdc++.h>
using namespace std;
long long sum,number[11][3],num=0;
int pd(){
	for(int s1=2;s1<=sum;s1++)
		if((num*number[1][1]+number[1][2])%number[s1][1]!=number[s1][2])
			return 1;
	return 0;
}
int main(){
	scanf("%d",&sum);
	for(int s1=1;s1<=sum;s1++) scanf("%d%d",&number[s1][1],&number[s1][2]);
	while(1){
		if(pd()==0)
			break;
		num+=1;
	}
	printf("%d",num*number[1][1]+number[1][2]);
    return 0;
}