#include <bits/stdc++.h>   #pragma GCC optimaze( Ofast );   #pragma GCC optimize( unroll-loops )   using namespace std;   const long long maxk = 1e8 + 113;   const long long maxb = 1e18 + 113;   const long long inf = 2e18;   struct line {     long long k, b;     line() {       this->k = 0;       this->b = 0;     }     line(long long k, long long b) {       this->k = k;       this->b = b;     }     long long func(long long x) { return k * x + b; }   };   struct LiChao {     vector<line> ms;     vector<int> le, re;     long long range;     LiChao() {       this->range = maxk - 113;       ms.push_back(line());       le.push_back(-1);       re.push_back(-1);     }     LiChao(long long range) {       this->range = range;       ms.push_back(line());       le.push_back(-1);       re.push_back(-1);     }     void clear() {       ms.clear();       le.clear();       re.clear();       ms.push_back(line());       le.push_back(-1);       re.push_back(-1);     }     void push(int v, bool e) {       if (!e && le[v] == -1) {         le[v] = ms.size();         ms.push_back(ms[v]);         le.push_back(-1);         re.push_back(-1);       }       if (e && re[v] == -1) {         re[v] = ms.size();         ms.push_back(ms[v]);         le.push_back(-1);         re.push_back(-1);       }     }     void add(int v, long long l, long long r, line in) {       long long m = (l + r) >> 1;       if (l > r) return;       if (in.func(m) > ms[v].func(m)) swap(in, ms[v]);       if (l == r) return;       if (in.func(l) > ms[v].func(l)) {         push(v, 0);         add(le[v], l, m, in);       } else {         push(v, 1);         add(re[v], m + 1, r, in);       }     }     void add(line in) { add(0, -range, range, in); }     long long get(int v, long long l, long long r, long long x) {       if (l >= r) return ms[v].func(x);       long long m = (l + r) >> 1;       if (x <= m) {         if (le[v] == -1) return ms[v].func(x);         return max(get(le[v], l, m, x), ms[v].func(x));       } else {         if (re[v] == -1) return ms[v].func(x);         return max(get(re[v], m + 1, r, x), ms[v].func(x));       }     }     long long get(long long x) { return get(0, -range, range, x); }   };   signed main() {     srand(1);     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.setf(ios::fixed);     cout.precision(15);     long long n, s;     cin >> n >> s;     long long df = 0;     vector<pair<long long, long long>> ed;     for (int i = 0; i < n; i++) {       long long v, c;       cin >> v >> c;       df = max(df, v);       ed.push_back({c, -v});     }     ed.push_back({s, 1});     sort(ed.begin(), ed.end());     long long range = 1e9 + 113 + s / df;     LiChao ms(range);     long long le = -1;     for (int i = 0; i < ed.size(); i++) {       ed[i].second *= -1;       long long r = max(le, 1LL);       while (ms.get(r) < ed[i].first) r <<= 1;       r = min(r, range);       while (le + 1 < r) {         long long m = (le + r) / 2;         if (ms.get(m) < ed[i].first)           le = m;         else           r = m;       }       if (ed[i].second != -1) {         long long k = ed[i].second;         ms.add(line(k, -r * k + ms.get(r) - ed[i].first));         le = r;       } else {         cout << r;         return 0;       }     }   }