Datasets:

slayone
/

uva_spoj_raw

#include<stdio.h>
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;
}

	#include<stdio.h>
	main()
	{
	int v,t;

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

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

	else
	break;
	}

	return 0;
	}