xs[0] = 0
xs[10000] = 10000
xs[20000] = 20000
xs[30000] = 30000
xs[40000] = 40000
xs[50000] = 50000
xs[60000] = 60000
xs[70000] = 70000
xs[80000] = 80000
xs[90000] = 90000
xs[0] = 0
xs[10000] = 10000
xs[20000] = 20000
xs[30000] = 30000
xs[40000] = 40000
xs[50000] = 50000
xs[60000] = 60000
xs[70000] = 70000
xs[80000] = 80000
xs[90000] = 90000