/*
#include <stdio.h>
int main()
{
int h, b, c, s;
scanf("%d %d %d %d", &h, &b, &c, &s);
printf("%.1lf MB", (double)h*b*c*s/8388608);
return 0;
}
*/
#include <stdio.h>
int main()
{
int a, b, c;
scanf("%d %d %d", &a, &b, &c);
printf("%.2lf MB", (double)a*b*c/8388608);
return 0;
}
