package com.yao.app.euler;
public class Euler2 {
public static void main(String[] args) {
int limit = 4000000;
int result = 0;
int sum = 0;
int n = 1;
while (result < limit) {
result = f(n);
if (result % 2 == 0)
sum += result;
n++;
}
System.out.println(sum);
}
private static int f(int n) {
if (n == 2)
return 2;
if (n == 1)
return 1;
return f(n - 1) + f(n - 2);
}
}