入门训练 Fibonacci数列

#include<iostream>
using namespace std;
int main()
{
    int n;
    while(cin >> n)
    {
        int x = 1;
        int y = 1;
        int z;
        if(n < 3)
          cout << 1 << endl;
        else
        {
            for(int i = 3; i <= n; i++)
            {
                z = x + y;
                z = z % 10007;
                x = y;
                y = z;
            }
            cout << z << endl;        
        }
    }
}