sizes = [7, 7, 7, 6, 7, 5]

t = 0
for line in open("input"):
    if 'x' in line:
        line = line.strip()
        s = line.replace("x"," ").replace(":","").split()
        n = map(int, s)
        w, h, *n = n
        need = sum(sizes[i]*x for i,x in enumerate(n))
        if need > w*h:
            print(line, "impossible")
        else:
            print(line, "<>", w*h - need)
            t += 1

print(t)