#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    vector<long long> dp(1001001);
    int N,W; cin >> N >> W;
    int bv = 0,bw = 1;
    while(N--){
        int v,w; cin >> v >> w;
        if(bv*w < v*bw) bv = v,bw = w;
        for(int i=w; i<1001001; i++) dp.at(i) = max(dp.at(i),dp.at(i-w)+v);
    }
    if(W < 1001001) cout << dp.at(W) << endl;
    else{
        long long over = (W-1001001)/bw+1;
        long long answer = over*bv;
        W -= over*bw;
        answer += dp.at(W);
        cout << answer << endl;
    }
}