import sys
stdin = sys.stdin
 
sys.setrecursionlimit(10**5) 
 
def li(): return map(int, stdin.readline().split())
def li_(): return map(lambda x: int(x)-1, stdin.readline().split())
def lf(): return map(float, stdin.readline().split())
def ls(): return stdin.readline().split()
def ns(): return stdin.readline().rstrip()
def lc(): return list(ns())
def ni(): return int(stdin.readline())
def nf(): return float(stdin.readline())

def rec(a: int, b: int) -> int:
    if a == b:
        return a
    
    else:
        mx = max(a,b)
        mn = min(a,b)
        return 2*mn + rec(mn, mx-mn)
    
n,x = li()
print(n + rec(x, n-x))
    