from math import prod with open("input") as f: data = [[int(x) for x in line] for line in f.read().strip().split('\n')] data = [[9]*len(data[0])] + data + [[9]*len(data[0])] data = [[9]+line+[9] for line in data] print(sum(1+data[i][j] for i in range(1, len(data)-1) for j in range(1, len(data[0])-1) if all(data[i][j]