UVA 10071 - Back to High School Physics

#include
main()
{
int v,t;

while(scanf("%d %d",&v,&t)==2)

{
if(v>=-100 && v<=100)
{
    if(t>=0 && t<= 200)
printf("%d\n",2*v*t);
}

else
break;
}

return 0;
}