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#include <bits/stdc++.h>
using namespace std;
int n,v[5005],w[5005],g,dp[2][10005];
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int main(){
in >> n >> g;
for(int i=1;i<=n;i++) in >> w[i] >> v[i];
for(int i=1;i<=n;i++){
for(int j=1;j<=g;j++){
if(w[i]>j) dp[1][j]=dp[0][j];
else dp[1][j]=max(dp[0][j],dp[0][j-w[i]]+v[i]);
}
for(int j=1;j<=g;j++){
dp[0][j]=dp[1][j];
}
}
out << dp[0][g];
}