View Code of Problem 23

#include<stdio.h>
#include<stdlib.h>
int sum(int m){
    if(m==1)return 1;
    else if(m==2)return 2;
    else if(m>2) return sum(m-1)+sum(m-2);
}


int main(){
    int m;
    
    while((scanf("%d",&m)!=EOF)){
        if(m==0)break;
        if(m>90)break;
        
        else printf("%d\n",sum(m));

    }
}