#include <stdio.h>
int main()
{
    FILE *f;
    static int w[5000],p[5000],v[10000],n,g,s,i,j;

    f = fopen("rucsac.in","rt");
    fscanf(f,"%d %d",&n,&g);

    for (i = 0; i < n; i++)
        fscanf(f,"%d %d",&w[i],&p[i]);
    fclose(f);

    for(i = 0; i < n; i++)
        for(j = g - w[i]; j >= 0; j--)
            if( v[j + w[i]] < v[j] + p[i] )
            {
                v[j + w[i]] = v[j] + p[i];
                if(v[j + w[i]] > s)
                    s = v[j + w[i]];
            }

    f = fopen("rucsac.out","wt");
    fprintf(f,"%d",s);
    fclose(f);

    return 0;
}