Submission

Score: 100

User: punnatat5354

Problemset: อนุกรม

Language: cpp

Time: 0.003 second

Submitted On: 2025-01-12 20:35:26

#include<iostream>
#include<cmath>

using namespace std;
int main()
{
	long long int a = 1 ;
	long long int b = 1 ;
	long long int n ; 
	long long int c ;
	cin >> n ;
	c = a + b ;
	if (n >= 3){
		n = n - 3 ;
		for(int i = 1  ;i <= n  ; i = i + 1){
			a = b ;
			b = c ;
			c = a + b ;
		}	
		cout << c ;
	}
	else{
		cout << a ;
	}
}