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