#include <stdio.h>

int main () {
  long long n = 0LL;
  int a1 = 0;
  long long b1 = 0LL;
  int a2 = 0;
  long long b2 = 0LL;
  int a3 = 0;
  long long b3 = 0LL;
    
  int res = 0;
  
  long long ans = 0LL;
  
  res = scanf("%lld", &n);
  res = scanf("%d", &a1);
  res = scanf("%lld", &b1);
  res = scanf("%d", &a2);
  res = scanf("%lld", &b2);
  res = scanf("%d", &a3);
  res = scanf("%lld", &b3);
  
  for (int i = 0; i < a3; i++) {
    for (int j = 0; j < a3; j++) {
      if ((long long)(i*a1+j*a2) <= n) {
        long long tmp = b1*((long long)i)+b2*((long long)j)+b3*((n-((long long)(i*a1+j*a2)))/((long long)a3));
        if (tmp > ans) {
          ans = tmp;
        }
      }
    }
  }
  
  for (int i = 0; i < a2; i++) {
    for (int j = 0; j < a2; j++) {
      if ((long long)(i*a1+j*a3) <= n) {
        long long tmp = b1*((long long)i)+b3*((long long)j)+b2*((n-((long long)(i*a1+j*a3)))/((long long)a2));
        if (tmp > ans) {
          ans = tmp;
        }
      }
    }
  }
  
  for (int i = 0; i < a1; i++) {
    for (int j = 0; j < a1; j++) {
      if ((long long)(i*a2+j*a3) <= n) {
        long long tmp = b2*((long long)i)+b3*((long long)j)+b1*((n-((long long)(i*a2+j*a3)))/((long long)a1));
        if (tmp > ans) {
          ans = tmp;
        }
      }
    }
  }
  
  printf("%lld\n", ans);
  return 0;
}