20 lines
413 B
C++
20 lines
413 B
C++
#include <iostream>
|
|
#include <vector>
|
|
using namespace std;
|
|
int main(){
|
|
vector<int> feb;
|
|
int n, a, m, x;
|
|
cin >> a >> n >> m >> x;
|
|
feb.reserve(n);
|
|
feb.push_back(1);feb.push_back(1);
|
|
for(int i = 2; i < n; i++){
|
|
feb[i] = feb[i - 1] + feb[i - 2];
|
|
}
|
|
int b = (m - (feb[n - 4] + 1) * a) / (feb[n - 3] - 1);
|
|
int out = (feb[x - 3] + 1) * a + (feb[x - 2] - 1) * b;
|
|
cout << out << endl;
|
|
return 0;
|
|
}
|
|
//5 7 32 4
|
|
|