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#include <bits/stdc++.h>
#define nmax 5005
#define gmax 10005
using namespace std;
int main()
{
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
/*
fin>>n>>g;
for(int i=1; i<=n; i++) {
fin>>w[i]>>p[i];
}
for(int i=1; i<=n; i++) {
for(int j=g; j>=w[i]; j--) {
dp[j] = max(dp[j-w[i]]+p[i], dp[j]);
}
}
fout<<dp[g]<<endl;
*/
int n, g;
int dp[gmax];
dp[0] = 0;
fin>>n>>g;
for(int i = 1; i<=n; i++) {
int w, p;
fin>>w>>p;
for(int j=g; j>=w; j--) {
dp[j] = max(dp[j-w]+p, dp[j]);
}
}
fout<<dp[g]<<endl;
return 0;
}