ACM 10071 - Back to High School Physics

#include <stdio.h>

int main()
{
    int v, t;
    while (1)
    {
        if ( scanf("%d %d", &v, &t) < 2) break;
        int m = 2 * v * t;
        printf("%d\n", m);
    }
    return 0;
}

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