#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define dbg(x) cout << #x << '=' << x << '\n';
#define ll long long
#define inf 1e18
#define sz size()
#define x first
#define y second
#define pi pair <int, int>
#define pii pair <pi, pi>
#define vi vector <int>
const ll mod = 1e9 + 7;
int n, w[5001], g, p[5001], dp[2][10001];

int32_t main(){
    ios_base :: sync_with_stdio(0); cin.tie(); cout.tie();
    ifstream cin("rucsac.in");
    ofstream cout("rucsac.out");
    cin>>n>>g;
    for(int i=1; i<=n; i++){
        cin>>w[i]>>p[i];
    }
    for(int i=1; i<=n; i++){
        int ctrl1=i%2; int ctrl2=((i%2)+1)%2;
        for(int j=1; j<=g; j++){
            if(w[i]>j) dp[ctrl1][j]=dp[ctrl2][j];
            else dp[ctrl1][j]=max(dp[ctrl2][j-w[i]]+p[i], dp[ctrl2][j]);
        }
    }
    cout<<dp[n%2][g];
}