View Code of Problem 23

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

}