#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#include <map>
#include <stdio.h>
#include <sys/mman.h>

// clang-format off
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;} //
#define RDULL(v) unsigned long long v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;} //
#define wt_int(var,buf,ptr) while(var){buf[ptr++]=var%10;var/=10;}while(ptr--)putc_unlocked(buf[ptr]+'0',stdout);
// clang-format on

int a[100000];
int main() {
    char *rp = (char *)mmap(0l, 1l << 28, 1, 2, 0, 0ll);
    RD(n) RD(w);
    int *ap = a;
    for (int i = 0; i < n; ++i) {
        RD(t);
        *ap++ = t;
    }

    int v = 0, ng_cnt = 0, ma = 0;
    int l = 0, r = 0;

    std::map<int, int> mp;
    // clang-format off
#define add(idx) {v += a[idx]; mp[a[idx]]++; if (mp[a[idx]] >= 2) ng_cnt++; idx++;}
#define remove(idx) {v -= a[idx]; mp[a[idx]]--; if (mp[a[idx]] == 1) ng_cnt--; idx++;}
#define evaluate() ((ng_cnt > 0 || v > w) ? -1 : 0)
#define consume() {if (r - l > ma) ma = r - l;}
    // clang-format on

    if (r <= n) add(r);
    do {
        int e = evaluate();
        if (ng_cnt > 0 || v > w) remove(l) else {
                if (e == 0) consume() if (r <= n - 1) add(r) else remove(l)
            }
        if (l == r && r <= n - 1) add(r)
    } while (l < n && r <= n);

    if (ma == 0) {
        putc_unlocked('0', stdout);
    } else {
        char buf[9];
        n = 0;
        wt_int(ma, buf, n);
    }

    return 0;
}