#include <stdio.h>
#include <stdlib.h>
#include <complex.h>
#include <math.h>

int readPaulicoeffs(int* alpha, int* beta, int* gamma, int* delta, int numqubits);
complex double Gausssum1d(int quadraticcoeff, int linearcoeff);
complex double Kroneck(int arg);
  
// order of matrix elements is [row][column]!!!

int main()
{

  int i;
  
  int N;              // number of qubits
  scanf("%d", &N);

  int alpha[N], beta[N], gamma[N], delta[N];

  double complex summand, sum;

  while(readPaulicoeffs(alpha, beta, gamma, delta, N)) {

    //    for(i=0; i<N; i++)
    //      printf("%d %d %d %d\n", alpha[i], beta[i], gamma[i], delta[i]);

    sum = 1.0 + 0.0*I;

    for(i=0; i<N; i++) {
      summand = 0.0*I;
      summand += 0.5*(Kroneck(gamma[i]+delta[i]) + pow(-1,beta[i])*Kroneck(gamma[i]+delta[i])
			   +csqrt(I)*cpow(-I,delta[i])*Kroneck(alpha[i]+beta[i]) + csqrt(-I)*cpow(I,delta[i])*Kroneck(alpha[i]+beta[i]));
      sum *= summand;
    }
    //printf("%lf+%lfI\n", creal(sum), cimag(sum));
    printf("%lf\n", cabs(creal(sum))); 


  }

  return 0;
}

complex double Kroneck(int arg)
{
  arg = (arg+1)%2; // output 1 if argument is 0 mod 2 and 0 otherwise
  return ((complex double)arg);
}

complex double Gausssum1d(int quadraticcoeff, int linearcoeff)
{
  // we assume coeffs are either 0 or 1
  quadraticcoeff %= 2;
  linearcoeff %= 2;
    
  if(quadraticcoeff == 0)
    if(linearcoeff == 0)
      return 2.0+0.0*I;
    else
      return 0.0*I;
  else
    if(linearcoeff == 0)
      return 1.0+1.0*I;
    else
      return 1.0-1.0*I;

}

int readPaulicoeffs(int *alpha, int *beta, int *gamma, int *delta, int numqubits)
{

  int i;

  if(scanf("%d %d %d %d", &alpha[0], &beta[0], &gamma[0], &delta[0]) != EOF) {
    for(i=1; i<numqubits; i++) {
      scanf("%d %d %d %d", &alpha[i], &beta[i], &gamma[i], &delta[i]);
    }
    return 1;
  } else
    return 0;

}