// find the first prime in a file of numbers

import java.io.*;     // for File
import java.util.*;   // for Scanner
public class FirstPrime {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner input = new Scanner(new File("integers.txt"));
		int first = scanForPrime(input);
		if(first==0) {
			System.out.println("No primes were found.");
		} else {
			System.out.println("First prime was " + first + ".");
		}
	}

	public static int scanForPrime(Scanner s) {
		// scan for the first prime and return it
		while (s.hasNextInt()) {
			// check if it's prime
			int n = s.nextInt();
			if (isPrime(n)) {
				return n;
			}
		}
	return 0;
	}
	   
	public static boolean isPrime(int n) {
		for(int i=2; i*i <= n; ++i) {
			if(n % i == 0) {
				return false;
			}
		}
		return true;
	}
}