#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using namespace std;

inline void chmax(int& x, int y) { if (x < y) x = y; }

int main() {
    int n, I;
    cin >> n >> I;
    
    vector<int> s(n), a(n);
    rep(i, n) cin >> s[i] >> a[i];
    
    vector<int> dp(I+1);
    rep(i, n) {
        for (int j = I-s[i]; j >= 0; --j) {
            chmax(dp[j+s[i]], dp[j]+a[i]);
        }
    }
    
    cout << dp[I] << '\n';
    
    return 0;
}