include[HTML_REMOVED]

using namespace std;
const int N=1010;
int n,m;
int v[N],c[N];
int f[N][N];
int main(){
cin>>n>>m;
for(int i=1;i<=n;i++)cin>>v[i]>>c[i];

for(int i=1;i<=n;i++){
    for(int j=0;j<=m;j++){
        f[i][j]=f[i-1][j];
        if(j>=v[i]){
            f[i][j]=max(f[i][j],f[i][j-v[i]]+c[i]);
        }
    }
}
cout<<f[n][m]<<endl;
return 0;

}