#include <iostream>
using namespace std;
int main()
{
	int first=1;
		int secound=1;
		cout<<"1. number is "<<first<<endl;
		cout<<"2. number is "<< secound<<endl;
		for(int i=3;i<=20;i++)
		{
			int next=first+secound;
			cout<<i<<". number is "<< next<<endl;
			first=secound;
			secound=next;
		}
}