#include <bits/stdc++.h>
#define ft first
#define sc second
#define pt(sth) cout << sth << "\n"
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
template<class T>bool chmax(T &a, const T &b) {if(a<b) {a=b; return 1;} return 0;}
template<class T>bool chmin(T &a, const T &b) {if(b<a) {a=b; return 1;} return 0;}
static const ll INF=1e18;
static const ll MAX=101010;
static const ll MOD=998244353;

//for(i=0; i<N; i++) cin >> a[i];



int main(void) {
  ll i, j, k;
  
  ll N, W;
  cin >> N >> W;
  ll a[MAX];
  
  
  
  for(i=0; i<N; i++) cin >> a[i];
  
  map<ll, ll> use;
  ll r=0;
  ll ans=0;
  ll S=0;
  for(ll l=0; l<N; l++) {
    
    while(r<N && !use[a[r]] && S+a[r]<=W) {
      S+=a[r];
      use[a[r]]=1;
      r++;
    }
    chmax(ans, r-l);
    
    if(l==r) r++;
    else {
      S-=a[l];
      use[a[l]]=0;
    }
    
  }
  
  pt(ans);
  
  
  
  
  
}