  vector<int> x = { 2,7,1,1,4,9,3,2,1,4,1,9,6,1,3,0,1,2,3,6,8,5,6,9,
    3,0,8,1,8,8,7,0,7,8,5,0,2,2,3,7,1,7,2,4,7,7,5,9,0,7,7,9,2,2,2,7,
    0,0,5,4,6,3,9,3,5,1,0,0,9,2,9,2,8,5,0,8,5,7,0,9,6,4,9,7,8,8,6,5,
    4,3,2,5,8,9,4,6,8,7,9,9 };