View Code of Problem 23

#include<stdio.h>
int main()
{
    long int a,b,t,i;
    a=1;
    b=2;
    int n;

    while(scanf("%d",&n)<=90){
            if(n==0){
                break;
            }

        for(i=0;i<n-1;i++){
            t=b;
            b=a+b;
            a=t;
        }
        printf("%ld\n",a);
        a=1;
        b=2;
    }
}