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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main(){
int n,k;
fin>>n>>k;
vector<int>dp(k+1,0);
vector<pair<int,int>>v(n);
for(auto &x:v) fin>>x.first>>x.second;
for(int i=0;i<n;i++){
for(int j=k-v[i].first;j>=0;j--){
dp[j+v[i].first]=max(dp[j]+v[i].second,dp[j+v[i].first]);
}
}
int ans=0;
for(auto x:dp) ans=max(x,ans);
fout<<ans;
return 0;
}