View Code of Problem 23

#include<bits/stdc++.h>
using namespace std;

int main() {

	int m;
	while(cin>>m&&m!=0) {
		long long pre=0,now=1;
		for(int i=1; i<=m; i++) {
			long long k=now;
			now+=pre;
			pre=k;
		}
		cout<<now<<endl;

	}

	return 0;
}