int?main()
{
int?price[100];
intn,?m,?total?=?0,?i;
scanf("%d?%d",?&n,?&m);
i?=?0;
while?(i?<?n)?{
int?no,?p;
scanf("%d?%d",?&no,?&p);
price[no-1]?=?p;
i++;
}
i?=?0;
while?(i?<?m)?{
int?no,?cnt;
scanf("%d?%d",?&no,?&cnt);
total?+=?cnt?*?price[no-1];
i++;
}
printf("%dn",?total);
return?0;
}
