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#include <fstream>
#include <iostream>
using namespace std;
ifstream f ("rucsac.in");
ofstream gout ("rucsac.out");
const int NMAX = 5e3;
const int GMAX = 1e4;
int dp[GMAX+1];
int p[NMAX+1], g[NMAX+1];
int main()
{
int n, w;
f >> n >> w;
for(int i=1; i<=n; i++)
f >> g[i] >> p[i];
for(int i=1; i<=n; i++){
for(int j=w; j>=0; j--){
if(j - g[i] >= 0)
dp[j] = max(dp[j], dp[j - g[i]] + p[i]);
}
}
gout << dp[w];
return 0;
}