View Code of Problem 23

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
using namespace std;

int main() {
	int n,i,j;
	while(scanf("%d",&n)) {
		if(n==0) {
			break;
		}
		long long int big=1,small=0;
		for(i=1; i<n; i++) {
			long long int temp=big;
			big=big+small;
			small=temp;
		}
		printf("%lld\n",big+small);
	}
}