////////////////////////////// Author:eldaee, coder_viper!!!!!!!!!!!!!!!!!!!!!!!!11
#pragma GCC optimize ("Ofast")
#include <bits/stdc++.h>
#define int long long
#define str string
#define vec vector
#define dou double
#define ld long double
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define YES cout << "YES" << '\n'
#define Yes cout << "Yes" << '\n'
#define NO cout << "NO" << '\n'
#define No cout << "No" << '\n'
#define gcd __gcd
#define all(x) x.begin(),x.end()
#define eldaee ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
/*
*/
using namespace std;
void solve() {
int n, k;
cin >> n >> k;
int h[100001];
for (int i = 0; i < n; i++) {
cin >> h[i];
}
int x = 0;
if (n <= 15) {
int y = 1;
for (int i = 0; i < n; i++) {
y *= 2;
}
int mi = n - 1;
for (int j = 0; j < y; j++) {
int sm = 0;
int c = 0;
for (int i = 0; i < n; i++) {
sm += h[i];
if (sm > k) {
c++;
sm = h[i];
}
}
if (sm <= k) {
if (c < mi) {
mi = c;
}
}
}
x = mi;
}
else {
int sm = 0;
for (int i = 0; i < n; i++) {
sm += h[i];
if (sm > k) {
x++;
sm = h[i];
}
}
}
cout << x << '\n';
}
signed main()
{
eldaee
solve();
}
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