Rectangular business cards measuring 5 centimeters (cm) wide and 7 centimeters (cm) long were laid out without overlapping, filling the bottom of the square box. How many centimeters (cm) is each side of this box at its smallest size?
5 7 [OP_LCM]
var_a = 5
var_b = 7
var_c = var_b * var_a / math.gcd(int(var_b), int(var_a))
print(int(var_c))