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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,p[5010],w[5010],dp[2][10010];
int main()
{
fin >>n >>g;
for(int i = 1;i <= n;i++)
{
fin >>w[i] >>p[i];
}
for(int i = 1;i <= n;i++)
{
for(int c = 0;c <= g;c++)
{
dp[1][c] = dp[0][c];
if(c-w[i] >= 0)
{
dp[1][c] = max(dp[1][c],dp[0][c-w[i]]+p[i]);
}
}
for(int j = 0;j <= g;j++)
{
dp[0][j] = dp[1][j];
}
}
fout <<dp[1][g];
return 0;
}