N,S,L=int(input()),0,0
while(S**3+S*5+6)/6<N:S+=1
N=(S**3+S*5+6)//6-N
if N==0:print((1<<S+1)-1);exit()
while(L+1)*L/2<N:L+=1
N-=L*(L-1)//2
print((1<<(S+1))-1-(1<<L+1)+(1<<L-N+1))