//practice

#include <iostream>
using namespace std;

int main ()
{
	int n;
	int number[100];
	for (int i=0; i<=99; i=i+1){
		number[i]=4*i+10;
	}
	for (int i=0; i<=99; i=i+1){
		cout<<"\nInput a number:"; cin>>n;
			if (number[i]==n)
				cout<<"number["<<i<<"]";
	}
}