UVA 10071 | | Back to High School Physics

#include<stdio.h>
int main()
{
int v,t;
while (scanf("%d %d",&v,&t)==2)
{
if ((v>=-100)&&(v<=100)&&(t>=0)&&(t<=200))
printf("%d\n",2*v*t);
}
return 0;
}