View Code of Problem 23

#include<bits/stdc++.h>
using namespace std;
int main(){
	long long a[91]={0},n;
	a[0]=1;a[1]=1;
	for(int i=2;i<91;i++)
		a[i]=a[i-1]+a[i-2];
	while(cin>>n&&n>0){
		cout<<a[n]<<endl;
	}
}