#include <bits/stdc++.h>
#include <random>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef double ld;
//#define ll __int128
//#define int ll
//#define int ll
//#define char ll
typedef vector<char> vc;
typedef vector<vc> vvc;
typedef vector<vvc> vvvc;
typedef pair<int, int> pii;
typedef pair<pii, pii> piii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vpi;
typedef vector< vi > vvi;
typedef vector< vvi > vvvi;
typedef vector<short> vs;
typedef vector<vs> vvs;
typedef vector<vvs> vvvs;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<ld> vld;
typedef vector<vld> vvld;
typedef vector<vvld> vvvld;
typedef vector<string> vst;
typedef vector<vst> vvst;
typedef pair<ld, ld> pld;

#define inmin(a, b) a = min(a, (b))
#define inmax(a, b) a = max(a, (b))
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define sqr(x) ((x) * (x))
#define fori(i, n) for(int i = 0; i < int(n); ++i)
#define SZ(a) ((int)((a).size()))
#define triple(T) tuple<T, T, T>
#define quad(T) tuple<T, T, T, T>
#define watch(x) cerr << (#x) << " = " << (x) << endl;

#ifdef MAX_HOME
#define cerr cout
#else
#define cerr if (false) cerr
#endif

const double PI = 2 * acos(0.0);
#define rand shittttty_shit
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng_64(chrono::steady_clock::now().time_since_epoch().count());

const string DIGITS = "0123456789";
const string ALPH = "abcdefghijklmnopqrstuvwxyz";


template <class T0, class T1>
inline ostream & operator << (ostream &out, pair<T0, T1> &a) {
    return out << "{" << a.first << ", " << a.second << "}";
}

template <class T0, class T1>
inline istream & operator >> (istream &in, pair<T0, T1> &a) {
    return in >> a.first >> a.second;
}

template <class T0, class T1, class T2>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << "}";
}

template <class T0, class T1, class T2, class T3>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2, T3> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << ", " <<  get<3>(a) << "}";
}

template<class T>
inline ostream & operator << (ostream &out, vector<T> &a) {
    out << "[";
    fori (i, a.size())
        out << a[i] << vector<string>{", ", "]  "}[i + 1 == a.size()];
    return out;
}


void smain();



signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
#ifdef MAX_HOME
    freopen("input.txt", "r", stdin);
    clock_t start = clock();
#endif
    cout << setprecision(4) << fixed;
    smain();
#ifdef MAX_HOME
    cout << "\n\n\n\nTOTAL EXECUTION TIME: " << float( clock () - start ) /  CLOCKS_PER_SEC << endl;
#endif
    return 0;
}

const int N = 2e5 + 10;
const int L = 44;
const ll oo = 1e9 + 10;

ll dp[N][L];

void smain() {

    int n, T;
    cin >> n >> T;
    vector<pll> a;
    vl bones;
    fori (i, n) {
        pll cur;
        cin >> cur.first >> cur.second;
        cur.first++;
        if (cur.first == 1) {
            bones.push_back(cur.second);
        } else {
            a.push_back(cur);
        }
    }

    sort(ALL(a), [&] (const pll & f, const pll & s) -> bool {
        return f.second * s.first + s.second + s.first < s.second * f.first + f.second + f.first;
    });

    fori (i, L) {
        dp[0][i] = oo;
    }
    dp[0][0] = 0;
    n = a.size();
    for (int i = 0; i < n; ++i) {
        fori (cnt, L) {
            dp[i + 1][cnt] = dp[i][cnt];
        }

        fori (cnt, L - 1) if (dp[i][cnt] < oo) {
            inmin(dp[i + 1][cnt + 1], (dp[i][cnt] + 1) * a[i].first + a[i].second );
        }
    }
    cin >> T;
    sort(ALL(bones));
    int ans = 0;
    fori (cnt, L) {
        if (dp[n][cnt] > T)
            continue;
        ll fre = T - dp[n][cnt];
        int cans = cnt;
        for (auto b : bones) {
            if (fre - b - 1 >= 0) {
                fre -= b + 1;
                cans++;
            }
        }
        inmax(ans, cans);
    }
    cout << ans;

}

Measured memory_bytes: 72428