求助！

#include <iostream>
using namespace std;
int daka(int a)
{
    if (a <= 1)
    {
        return 1;
    }
    else
        return daka(a - 1) + daka(a - 2);
}
int main()
{
    int b;
    cin >> b;
    cout << daka(b);
    return 0;
}