import Intcode
code = list(map(int, open("input.txt", "r").read().strip().split(","))) + [0]*10000000

painted = []
x = 500
y = 500
board = [[0]*1001]*1001
index = 0
directions = [(0, 1), (1, 0), (0, -1), (-1, 0)]

c = Intcode.Intcode_Computer(code, 0)
while not c.halted:
    c.inputs.append(board[x][y])
    for i in range(2):
        c.run()
    paint = c.outputs[-2]
    turn = c.outputs[-1]
    
    board[x][y] = paint
    
    if((x, y) not in painted):
        painted.append((x, y))
        
    if(turn == 1):
        index += 1
    if(turn == 0):
        index -= 1
    if(index > 3):
        index = 0
    if(index < 0):
        index = 3
        
    x += directions[index][0]
    y += directions[index][1]
    
print(len(painted))