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#include <bits/stdc++.h>
#define lim 10010
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n, dp[lim], gmax, g, p, rez=-1;
int main()
{
in>>n>>gmax;
for(int i=1; i<=n; i++)
{
in>>g>>p;
for(int j=gmax-g; j>0; j--)
if(dp[j] && dp[j+g]<dp[j]+p)
dp[j+g]= dp[j]+p, rez=max(rez, dp[j+g]);
dp[g]=max(dp[g], p);
rez=max(rez, dp[g]);
}
out<<rez;
}