0055 - Sequence
#include <cstdio> #include <iostream> using namespace std; void Slove(double a) { double s=a; for (int i=2; i<=10; ++i) s+=(i%2)? a/=3 : a*=2; printf ("%.8lf\n", s); } int main(void) { double a; while (cin >> a) Slove(a); return 0; }
やるだけ。