View Code of Problem 23

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