// OB���h2009 Day3 A : Strange String Manipulation

#include <iostream>
#include <cmath>
#include <cstring>

using namespace std;

int main(){
	int n;
	while(cin >> n, n){
		int I[256];
		for(int i=0;i<n;i++) cin >> I[i];
		double Hmin = -1;
		int mS, mA, mC;
		for(int S=0;S<16;S++){
			for(int A=0;A<16;A++){
				for(int C=0;C<16;C++){
					double tmpH = 0.0;
					int R = S;
					int O[256];
					memset(O, 0, sizeof(O));
					for(int i=0;i<n;i++){
						R = (A*R+C)%256;
						O[(I[i]+R)%256]++;
					}
					for(int i=0;i<256;i++){
						if(O[i]!=0){
							double d = (double)O[i]/n;
							tmpH -= d*log(d);
						}
					}
					if(Hmin<-0.5||tmpH+1e-8<Hmin){
						Hmin = tmpH;
						mS = S; mA = A; mC = C;
					}
				}
			}
		}
		cout << mS << " " << mA << " " << mC << endl;
	}
	return 0;
}