دومینوار

main.cpp

// In the name of God

#include <bits/stdc++.h>

using namespace std;

const int maxn = 1e4 + 10 , mod = 1e9 + 7;

int fib[maxn];

int main() {
    int n;
    cin >> n;
    fib[0] = fib[1] = 1;
    for(int i = 2;i <= n;i++)
        fib[i] = (fib[i-1] + fib[i-2]) % mod;    
    cout << fib[n] << '\n';
}