View Code of Problem 23

#include<stdio.h>
int main(){
	int day;
	long int a[90];
	a[1]=1;
	a[2]=2;
	int i;
	for(i=3;i<=90;i++){
		a[i]=a[i-1]+a[i-2];
	}
	while(scanf("%d",&day)!=EOF){
		if(day==0) 
		break;
		printf("%d\n",a[day]);
	}
	return 0;
}