#include<bits/stdc++.h>
using namespace std;
struct m{
    int a,b,ab;
}ms[1001];
int cmp2(int a[],int b[]){
	if (a[0] > b[0])  return 1;
	if(a[0] < b[0])  return 0;
	for (int i = a[0];i >= 1;i--){
		if (a[i] > b[i])  return 1;
		if (a[i] < b[i])  return 0;
	}
	return 0;
}
bool cmp(m m1,m m2){
    return m1.ab < m2.ab;
}
void divi(int a[],int b,int c[]){
    int y = 0;
    for (int i = a[0];i >= 1;i--){
        int temp = y*10+a[i];
        c[i] = temp/b;
        y = temp%b;
    }
    int len = a[0];
    while(c[len] == 0 && len > 1)  len--;
    c[0] = len;
}
void multi(int a[],int b){
    int b1[5],lenb = 0;
    while(b){
        lenb++;
        b1[lenb] = b%10;
        b /= 10;
    }
    int temp[4001] = {},len = a[0] + lenb,x=0;
    for (int i = 1;i <= lenb;i++){
        for (int j = 1;j <= a[0];j++){
            temp[i+j-1] += b1[i]*a[j]+x;
            x = temp[i+j-1]/10;
            temp[i+j-1] %= 10;
        }
        if (x){
            temp[i+a[0]] = x;
            x = 0;
        }
    }
    while(temp[len] == 0 && len > 1)  len--;
    temp[0] = len;
    memcpy(a,temp,sizeof(temp));
}
void calc(int n){
    int s[4001] = {1,1};
    int ans[4001] = {};
    int maxgn[4001]={};
    multi(s,ms[0].a);
    for (int i = 1;i <= n;i++){ 
        divi(s,ms[n].b,ans);  //计算第i个人拿到的金币
        if(cmp2(ans,maxgn)) memcpy(maxgn,ans,sizeof(ans)); 
        multi(s,ms[i].a);
    }
    
    //printf("%d",s[0]);
    //for (int i = s[0];i > 0;i--)  printf("%d",s[i]);
  
    for (int i = ans[0];i > 0;i--)  printf("%d",maxgn[i]);
}
int main(){
    int n;
    cin>>n;
    scanf("%d%d",&(ms[0].a),&(ms[0].b));
    for (int i = 1;i <= n;i++){
        scanf("%d%d",&(ms[i].a),&(ms[i].b));
        ms[i].ab = ms[i].a * ms[i].b;
    }
    sort(ms+1,ms+n+1,cmp);
    calc(n);
    return 0;
}

高手求调，WA 2，怎么改都不对