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#include <stdio.h>
#include <stdlib.h>
int p[5000], w[5000];
int s[10000];
int main()
{
FILE*in = fopen("rucsac.in", "r");
FILE*out = fopen("rucsac.out", "w");
int n, g, nr, j;
fscanf(in, "%d %d", &n, &g);
int i;
for (i = 0; i < n; i++) {
fscanf(in, "%d %d", &w[i], &p[i]);
}
nr = 0;
for (i = 0; i < n; i++) {
for (j = g - w[i]; j >= 1; j--) {
if (s[j + w[i]] < s[j] + p[i]) {
s[j + w[i]] = s[j] + p[i];
if (s[j + w[i]] > nr) {
nr = s[j + w[i]];
}
}
}
}
fprintf(out, "%d", nr);
return 0;
}