add easy #31
add easy #31

tlseabra/dailyprogrammer,tlseabra/dailyprogrammer,tlgs/dailyprogrammer,tlseabra/dailyprogrammer,tlgs/dailyprogrammer,tlseabra/dailyprogrammer,tlgs/dailyprogrammer,tlgs/dailyprogrammer,tlgs/dailyprogrammer,tlseabra/dailyprogrammer,tlgs/dailyprogrammer,tlgs/dailyprogrammer