View Code of Problem 23

#include<stdio.h>
int main()
{
	long long a[1000];
    a[1]=1;a[2]=2;
	int i;
	for(i=3;i<=90;i++)
		a[i]=a[i-1]+a[i-2];
	int x;
	while(scanf("%d",&x),x!=0)
	{
		printf("%I64d\n",a[x]);
	}
	return 0;
}

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