#include <stdio.h>
#define NMax 5005
#define WMax 10005
using namespace std;

int n, W;
int w[NMax], v[NMax];

int value[WMax][NMax];

int main() {
    freopen("rucsac.in", "r", stdin);
	freopen("rucsac.out", "w", stdout);

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

    for (int i = 1; i <= n; i++) {
        scanf("%d %d", &w[i], &v[i]);
    }
    for (int cap = 0; cap <= W; cap++) { value[cap][0] = 0; }

    for (int i = 1; i <= n; i++) {
        for (int cap = 0; cap <= W; cap++) {
            value[cap][i] = value[cap][i-1];
            if (cap >= w[i]) {
                if (value[cap][i] < value[cap-w[i]][i-1] + v[i]) {
                    value[cap][i] = value[cap-w[i]][i-1] + v[i];
                }
            }
        }
    }
	printf("%d\n", value[W][n]);
    return 0;
}