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#include <bits/stdc++.h>
#define INF 2e9
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, G, dp[2][100005], g[5005], v[5005];
int main()
{
int i, j, sol;
fin >> n >> G;
for (i = 1; i <= n; i++)
fin >> g[i] >> v[i];
for (i = 1; i <= n; i++)
for (j = G; j >= 0; j--)
if (j >= g[i])
dp[i % 2][j] = max(dp[1 - (i % 2)][j - g[i]] + v[i], dp[1 - (i % 2)][j]);
else dp[i % 2][j] = dp[1 - (i % 2)][j];
sol = 0;
j = 1 - (i % 2);
for (i = 0; i <= G; i++)
sol = max(sol, dp[j][i]);
fout << sol;
return 0;
}