#include <iostream>
#include<string.h>
#include<cstdio>
using namespace std;
const int MAXN = 1005;
int f[MAXN];
int s[MAXN];
int sg[MAXN];
void getSG(int n)
{
    int i,j;
    for(i=1;i<=n;i++)
    {
        memset(s,0,sizeof(s));
        for(j=0;f[j]<=i&&j<=20;j++)
                s[sg[i-f[j]]]=1;
        for(j=0;;j++)
        {
            if(!s[j])
            {
                sg[i]=j;
                break;
            }
        }
    }
}
int main()
{
    f[1]=1,f[0]=1;
    for(int i=2;i<=16;i++)
        f[i]=f[i-1]+f[i-2];
        getSG(1000);
    int m,n,p;
    while(scanf("%d%d%d",&m,&n,&p),m||n||p)
    {
        if(sg[m]^sg[n]^sg[p])
            cout << "Fibo" << endl;
        else
            cout << "Nacci" << endl;
    }
    return 0;
}