Language: C++

#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <iomanip>
#include <cstring>
#include <map>

#define rep(i, N) for (int i = 0; i < (int)N; i++)
using namespace std;
typedef long long ll;
const ll LLINF = 9223372036854775807;
const int INF = pow(2,29);
const int MOD = 1000000007;

int main() {
  int N; cin >> N;
  int ga, sa, ba; cin >> ga >> sa >> ba;
  int gb, sb, bb; cin >> gb >> sb >> bb;

  ll r1 = 0, r2 = 0;
  for (int i=0; i*ga<=N; i++) {
    for (int j=0; i*ga+j*sa<=N; j++) {
      int k = (N-i*ga-j*sa)/ba;
      int lest = (N-i*ga-j*sa)%ba;
      r1 = max(r1, i*gb+j*sb+k*bb+lest);
    }
  }
  for (int i=0; i*gb<=r1; i++) {
    for (int j=0; i*gb+j*sb<=r1; j++) {
      int k = (r1-i*gb-j*sb)/bb;
      int lest = (r1-i*gb-j*sb)%bb;
      r2 = max(r2, i*ga+j*sa+k*ba+lest);
    }
  }

  cout << r2 << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:15: error: no matching function for call to 'max(ll&, int)'
   27 |       r1 = max(r1, i*gb+j*sb+k*bb+lest);
      |            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:27:15: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   27 |       r1 = max(r1, i*gb+j*sb+k*bb+lest);
      |            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:5:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:27:15: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   27 |       r1 = max(r1, i*gb+j*sb+k*bb+lest);
      |            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:34:15: error: no matching function for call to 'max(ll&, int)'
   34 |       r2 = max(r2, i*ga+j*sa+k*ba+lest);
      |            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:34:15: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   34 |       r2 = max(r2, i*ga+j*sa+k*ba+lest);
      |            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:34:15: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   34 |       r2 = max(r2, i*ga+j*sa+k*ba+lest);
      |            ~~~^~~~~~~~~~~~~~~~~~~~~~~~~