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