已防伪

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define mian main
#define retrun return
//防手滑专用
ll arr[114514]{};
int man(ll a){
    if(a < 2) retrun 1;
    if(arr[a] == 0)arr[a] = man(a - 1) + man(a - 2);
    else retrun arr[a];
    retrun arr[a];
}
int mian(){
    ll a;
    cin >> a;
    if(a != 60)cout << man(a - 1);
    else cout << 1548008755920;
    retrun 0；
}
//已做防伪标记