Description

n阶楼梯你现在站在第一阶
你每次可以向上走一步或者向上走两步
不能走出去
求从第一阶走到第n阶的方案数
输出答案对10000007取模

Format

Input

一个正整数n（n<=1000000）

Output

一个正整数即题目要求的答案

Sample 1

Input

33

Output

3524578

Sample 2

Input

4

Output

3

Limitation

1s, 128Mb for each test case.

Hint

Free Pascal Code

var a,b:longint;
begin
    readln(a,b);
    writeln(a+b);
end.

C Code

#include <stdio.h>
int main(void)
{
    int a, b;
    scanf("%d%d", &a, &b);
    printf("%d\n", a + b);
    return 0;
}

C++ Code

#include <iostream>
using namespace std;
int main()
{
    int a, b;
    cin >> a >> b;
    cout << a + b << endl;
    return 0;
}

Python Code

a, b = [int(i) for i in raw_input().split()]
print(a + b)

Java Code

import java.io.*;
import java.util.Scanner;

public class Main {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        System.out.println(a + b);
    }
}

Source

Vijos Original