#include <stdio.h>

#include <string.h>

#define MaxBuf 1<<22

#define RG register

#define inline __inline__ __attribute__((always_inline))

#define Blue() ((S==T&&(T=(S=B)+fread(B,1,MaxBuf,stdin),S==T))?0:*S++)

#define dmax(a,b) ((a)>(b)?(a):(b))

char B[MaxBuf],*S=B,*T=B;

inline void Rin(RG int &x) {

  x=;RG int c=Blue(),f=;

  for(; c<||c>; c=Blue())

    if(c==)f=-;

  for(; c>&&c<; c=Blue())

    x=(x<<)+(x<<)+c-;

  x*=f; }

int n,x,ans,f[];

int main() {

  Rin(n);

  while(n--) {

    register int t=;

    Rin(x);

    for(register int i=; i<=; i++)

      if(x&(<<i))

    t=dmax(f[i]+,t);

    for(register int i=; i<=; i++)

      if(x&(<<i))

    f[i]=t;

    ans=dmax(ans,t); }

  printf("%d\n",ans);

  fclose(stdin);

  return ; }