The mook jong(HDU 5366)

Description

![](../../data/images/C613-1001-1.jpg)

ZJiaQ want to become a strong man, so he decided to play the mook jong。ZJiaQ want to put some mook jongs in his backyard. His backyard consist of n bricks that is 1*1,so it is 1*n。ZJiaQ want to put a mook jong in a brick. because of the hands of the mook jong， the distance of two mook jongs should be equal or more than 2 bricks. Now ZJiaQ want to know how many ways can ZJiaQ put mook jongs legally(at least one mook jong).

Input

There ar multiply cases. For each case, there is a single integer n( 1 < = n < = 60)

Output

Print the ways in a single line for each case.

Sample Input

1

2

3

4

5

6

Sample Output

1

2

3

5

8

12

#include<bits/stdc++.h>
typedef long long lint;
using namespace std;
lint a[70];
int main()
{int n,m;memset(a,0,sizeof(a));int i;a[1]=1;int ans=1;a[2]=2;a[3]=3;for(i=4;i<65;++i){a[i]=a[i-1]+a[i-3]+1;++ans;}while(cin>>n){cout<<a[n]<<endl;}return 0;
}

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