N=int(input())

TOURNAMENT=[list(range(1,N+1))]
WINLIST=[]

while len(TOURNAMENT[-1])!=1:
    LEN=len(TOURNAMENT[-1])
    NEXT=[]

    for i in range(0,LEN,2):

        if i==LEN-1:
            NEXT.append(TOURNAMENT[-1][i])
            break

        x=TOURNAMENT[-1][i]
        y=TOURNAMENT[-1][i+1]

        print("?",x,y,flush=True)
        win=int(input())

        if x==win:
            NEXT.append(x)
            WINLIST.append([x,y])
        else:
            NEXT.append(y)
            WINLIST.append([y,x])
            

    TOURNAMENT.extend([NEXT])

WIN1=TOURNAMENT[-1][-1]

TOURNAMENT2=[]
for x,y in WINLIST:
    if x==WIN1:
        TOURNAMENT2.append(y)
    

TOURNAMENT=[TOURNAMENT2]
     
while len(TOURNAMENT[-1])!=1:
    LEN=len(TOURNAMENT[-1])
    NEXT=[]

    for i in range(0,LEN,2):

        if i==LEN-1:
            NEXT.append(TOURNAMENT[-1][i])
            break

        x=TOURNAMENT[-1][i]
        y=TOURNAMENT[-1][i+1]

        print("?",x,y,flush=True)
        win=int(input())

        if x==win:
            NEXT.append(x)
            WINLIST.append([x,y])
        else:
            NEXT.append(y)
            WINLIST.append([y,x])
            

    TOURNAMENT.extend([NEXT])

print(TOURNAMENT[-1][-1])