import java.util.Scanner;
class MyClass{
public static void main
(String[] args
){ Scanner sc
= new Scanner
(System.
in);
int N = sc.nextInt();
double happy = N;
double sad = 0;
for(int i=0; i<=4 ; i++){
double newHappy = happy * 0.3 + sad * 0.5;
double newSad = happy * 0.7 + sad * 0.5;
happy = newHappy;
sad = newSad;
}
}
}
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