1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
#include <iostream>
#include <vector>
#include <cmath>
#include <cstdio>

using namespace std;


int main(){
    int a,b; cin >> a >> b;

    vector<int> dp(a,0);

    dp[0] = 1;

    if(b == 1)
        cout << b;
    else{
        dp[1] = 2;
        for(int i = 2; i<a; ++i){

            dp[i] = dp[i-1] + dp[i-2];

        }

        long long g = dp[a-1] * b;
        cout << g;

    }


    return 0;
}