View Code of Problem 23

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

        printf("%ld\n",a[n-1]);
    }
}