C :

#include<stdio.h>
int main()
{
	int m,n,s,c;
	scanf("%d%d",&m,&n);
	s=n/m;
	c=5*s;
	printf("%d",c);
	return 0;
}

C++ :

#include <iostream>
using namespace std;

int main(){
	int x;
	int y;
	cin>>x;
	cin>>y;
	cout<<y/x*5<<endl;
}

Python :

s = input().split()
print(int(s[1])//int(s[0])*5)