#include <stdio.h>
#include <stdlib.h>

int fn(const void *a,const void *b)
{
    double *aa=(double *)a;
    double *bb=(double *)b;
    if(aa[1]>bb[1]) return 1;
    else return -1;
}
int main()
{
    double priceavg[100000][2],total;
    int i,k,m,p,price,kg,start=0;
    scanf("%d",&k);
    for(i=0;i<k;i++)
    {
        scanf("%lf%d",&priceavg[i][0],&price);
        priceavg[i][1]=priceavg[i][0]/price;
    }
    qsort(priceavg,k,sizeof(priceavg[0]),fn);
    /*printf("------------------\n\n");
    for(i=0;i<k;i++) printf("%lf %lf\n",priceavg[i][0],priceavg[i][1]);*/
    scanf("%d",&m);
    for(i=0;i<m;i++)
    {
        scanf("%d",&kg);
        total=0;
        if(priceavg[start][0]!=0)
        {
            if(kg<priceavg[start][0])
            {
                printf("%lf",priceavg[start][1]*kg);
                priceavg[start][0]-=kg;
            }
        }
    }
    return 0;
}