#include <stdio.h>
#define FIN "rucsac.in"
#define FOUT "rucsac.out"
#define MAXW 10001
#define MAXC 5001

  int i,j,
      n,//number of objects
      g,//capacity of the knapsack
      w[ MAXW ], //weight
      c[ MAXC ]; //costs

// A utility function that returns maximum of two integers
int max(int a, int b) { return (a > b)? a : b; }

int Profit(int n, int g) {

  int Cost[n+100][g+100]; 

  for(i = 1; i <= n; ++i) {

      for(j = 1; j <= g; ++j) {

          if(w[i] <= j) 

                      Cost[i][j] = max( Cost[i - 1][j - w[i]] + c[ i ], Cost[i-1][j] );     

                  else 

                      Cost[i][j] = Cost[ i - 1][ j ]; 
      }
  } 

  return Cost[n][g];
}


int main() {

  freopen(FIN, "r", stdin);
  freopen(FOUT, "w", stdout);

  scanf("%d %d", &n, &g);

  for(i = 1; i <= n; i++) {
      scanf("%d", &w[ i ]);
      scanf("%d", &c[ i ]);
  }

  printf("%d", Profit(n,g));

 return(0);
}