Contest3147 - game 38 of 2021 Freshmen's personal training match_ A: chicken

//
#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n,x,y;
    double temp,price;

    while( ~scanf("%*d%*d%d",&n) )      //  The first two data are useless 
    {
        price=1e6+7;
        while( n-- )
        {
            scanf("%d%d",&x,&y);
            temp=(double)x/y;
            price=min( price,temp );
        }
        printf("%.2lf\n",1000*price);
    }
    return 0;    
}