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