Rock paper scissor game

import random

def check(n1,n2):
    if n1==1 and n2==3 or n1==2 and n2==1 or n1==3 and n2==2:
        return("YOU WON")
    elif n1==n2:
        return("ITS a Tie")
    else:
        return("Computer won")

def comp(ran):
    if ran==1:
        print("computer Choosed: rock")
    elif ran==2:
        print("computer Choosed: paper")
    else:
        print("computer Choosed: scissors")

def startgame():
    p1 = int(input("Player: Press \n1.for rock \n2.for paper \n3.for scissors\n"))
    p2 = random.randint(1,3)
    comp(p2)
    print(check(p1,p2))

def Decision(f):
    if(f==1):
        startgame()
    else:
        print("Invalid Input")
        print("WELCOME TO ROCK PAPER SCISSORS GAME: ")
        first=int(input("PRESS 1 to Start"))
        Decision(first)



print("WELCOME TO ROCK PAPER SCISSORS GAME: ")
first=int(input("PRESS 1 to Start"))
Decision(first)