#include <iostream>
#include <cmath>
#include <cstring>
using namespace std;

static const double EPS = 1e-9;
static const int MOD = 256;

int I[257];
int R[257];
int O[257];

int main(){
  int N;

  while(cin >> N && N){
    for(int i = 1; i <= N; i++){
      cin >> I[i];
    }
    
    int ansS, ansA, ansC;
    double ansH = 100000000.0;

    for(int S = 0; S <= 15; S++){
      for(int A = 0; A <= 15; A++){
        for(int C = 0; C <= 15; C++){
          
          double H = 0;
          R[0] = S;
          memset(O, 0, sizeof(O));
          
          for(int i = 1; i <= N; i++){
            R[i] = (A * R[i - 1] + C) % MOD;
            O[ (I[i] + R[i]) % MOD ]++;
          }

          for(int i = 0; i < 256; i++){
            if(O[i] != 0) H -= (O[i] / (double)(N) * log(O[i] / (double)(N)));
          }
          
          if(H + EPS < ansH){
            ansH = H;
            ansS = S;
            ansA = A;
            ansC = C;
          }
        }
      }
    }

    cout << ansS << ' ' << ansA << ' ' << ansC << endl;
  }
  
  return 0;
}