View Code of Problem 23

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