#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(0); cin.tie(); cout.tie();mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
ifstream fin("rucsac.in"); ofstream fout("rucsac.out");
#define cin fin
#define cout fout

int g, n;
int w[5010], p[5010];
int dp[2][10010];
int32_t main(){
INIT
cin>>n>>g;
for(int i=1; i<=n; i++){
    cin>>w[i]>>p[i];
}


for(int i=1; i<=n; i++){
    for(int j=1; j<=g; j++){
        dp[1][j]=max(dp[1][j], dp[0][j]);
        if(w[i]>j){continue;}
        dp[1][j]=max(dp[1][j], dp[0][j-w[i]]+p[i]);
    }


    for(int j=1; j<=g; j++){
        dp[0][j]=dp[1][j]; dp[1][j]=0;
    }
}

cout<<dp[0][g];


return 0;
}