View Code of Problem 23

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main (){
	int m;
	while(~scanf("%d", &m)&&m){
		ll a[100];
		a[0] = 0;
		a[1] = 1;
		a[2] = 2;
		for(int i = 3;i <= m;i++){
			a[i] = a[i-1] + a[i-2];
		}
		printf("%lld\n", a[m]);
	}

	return 0;
}