class M{
  static int c(int[] a){
    int i=0,
        m = 1<<31,
        c;
    for(; ++i < a.length; m = a[i] * a[i-1] == 0 & (c = a[i] + a[i - 1]) > m
                           ? c
                           : m);
    return m;
  }
 
  public static void main(String[] a){
    System.out.println(c(new int[]{ 1, 4, 3, 6, 0, 3, 7, 0 }));
    System.out.println(c(new int[]{ 9, 4, 9, 0, 9, 0, 9, 15, -2 }));
    System.out.println(c(new int[]{ -4, -6, -2, 0, -9 }));
    System.out.println(c(new int[]{ -11, 0, 0, 0, 0, 0, -12, 10 }));
    System.out.println(c(new int[]{ 0, 20 }));
    System.out.println(c(new int[]{ 2, 1, 0 }));
  }
}

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