user: What is the c source code of the assembly code below:

```asm
<main>:
  endbr64
  push   %r14
  push   %r13
  lea    D16(%rip),%r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x650,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x648(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rbx
  lea    0x50(%rsp),%r12
  lea    0x690(%rsp),%r14
  nopl   (%rax)
L13:
  lea    -0x50(%r12),%rbp
  nopl   (%rax)
L98:
  mov    %rbp,%rsi
  mov    %r13,%rdi
  add    $0x4,%rbp
  call   <scanf@plt>
  cmp    %r12,%rbp
  jne    L98
  lea    0x50(%rbp),%r12
  cmp    %r14,%r12
  jne    L13
  lea    0x140(%rbx),%r11
  mov    $0x50,%r10d
  xor    %r9d,%r9d
  mov    $0xa0,%r8d
  mov    $0xffffffffffffff10,%rdi
  mov    $0x1,%esi
  nopw   0x0(%rax,%rax,1)
L66:
  lea    -0x50(%r11),%rdx
  nopl   0x0(%rax)
L9:
  lea    (%rdi,%rdx,1),%rcx
  mov    (%rdx),%eax
  imul   (%rcx,%r8,1),%eax
  imul   (%rcx,%r10,1),%eax
  imul   (%rcx,%r9,1),%eax
  cltq
  cmp    %rax,%rsi
  cmovl  %rax,%rsi
  add    $0x4,%rdx
  cmp    %r11,%rdx
  jne    L9
  sub    $0x50,%rdi
  add    $0x50,%r8
  add    $0x50,%r9
  add    $0x50,%r10
  lea    0x50(%rdx),%r11
  cmp    $0xfffffffffffff9c0,%rdi
  jne    L66
  lea    0x64c(%rbx),%rcx
  mov    $0x1,%r12d
  mov    $0x2,%ebp
  xor    %r11d,%r11d
  mov    $0x3,%r10d
  nopw   0x0(%rax,%rax,1)
L28:
  mov    %rbp,%r9
  mov    %r12,%r8
  lea    -0x640(%rcx),%rdx
  mov    %r11,%rdi
  sub    %r10,%r9
  sub    %r10,%r8
  sub    %r10,%rdi
  nopl   0x0(%rax)
L6:
  mov    (%rdx,%r9,4),%eax
  imul   (%rdx),%eax
  imul   (%rdx,%r8,4),%eax
  imul   (%rdx,%rdi,4),%eax
  cltq
  cmp    %rax,%rsi
  cmovl  %rax,%rsi
  add    $0x50,%rdx
  cmp    %rdx,%rcx
  jne    L6
  add    $0x1,%r11
  add    $0x1,%rbp
  add    $0x1,%r10
  add    $0x1,%r12
  add    $0x4,%rcx
  cmp    $0x11,%r11
  jne    L28
  lea    0x44(%rbx),%r8
  mov    $0xf0,%r11d
  mov    $0xa0,%r10d
  xor    %edi,%edi
  mov    $0x50,%r9d
  nopl   0x0(%rax)
L103:
  lea    -0x44(%r8),%rdx
  nopl   0x0(%rax)
L86:
  lea    (%rdi,%rdx,1),%rcx
  mov    (%rdx),%eax
  imul   0x4(%rcx,%r9,1),%eax
  imul   0x8(%rcx,%r10,1),%eax
  imul   0xc(%rcx,%r11,1),%eax
  cltq
  cmp    %rax,%rsi
  cmovl  %rax,%rsi
  add    $0x4,%rdx
  cmp    %rdx,%r8
  jne    L86
  sub    $0x50,%rdi
  add    $0x50,%r9
  add    $0x50,%r10
  add    $0x50,%r11
  add    $0x50,%r8
  cmp    $0xfffffffffffffab0,%rdi
  jne    L103
  add    $0x134,%rbx
  mov    $0x50,%r10d
  xor    %r9d,%r9d
  mov    $0xa0,%r8d
  mov    $0xffffffffffffff10,%rdi
  nopl   0x0(%rax)
L57:
  lea    -0x44(%rbx),%rdx
  nopl   0x0(%rax)
L21:
  lea    (%rdi,%rdx,1),%rcx
  mov    (%rdx),%eax
  imul   0x4(%rcx,%r8,1),%eax
  imul   0x8(%rcx,%r10,1),%eax
  imul   0xc(%rcx,%r9,1),%eax
  cltq
  cmp    %rax,%rsi
  cmovl  %rax,%rsi
  add    $0x4,%rdx
  cmp    %rdx,%rbx
  jne    L21
  sub    $0x50,%rdi
  add    $0x50,%r8
  add    $0x50,%r9
  add    $0x50,%r10
  add    $0x50,%rbx
  cmp    $0xfffffffffffff9c0,%rdi
  jne    L57
  lea    D13(%rip),%rdi
  call   <printf@plt>
  mov    0x648(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L105
  add    $0x650,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
L105:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: parse_data
arguments: label: D16
datatype: string
name: parse_data
arguments: label: D13
datatype: string

tool: D16: %d

tool: D13: %ld

assistant: ```c
int main() {
  int grid[20][20];
  for (int i = 0; i < 20; i++) {
    for (int j = 0; j < 20; j++) {
      scanf("%d", &grid[i][j]);
    }
  }
  long int product = 1, max_product = 1;
  int i, j;
  for (i = 3; i < 20; ++i) {
    for (j = 0; j < 20; ++j) {
      product = grid[i][j] * grid[i - 1][j] * grid[i - 2][j] * grid[i - 3][j];
      if (max_product < product) {
        max_product = product;
      }
    }
  }
  for (j = 3; j < 20; ++j) {
    for (i = 0; i < 20; ++i) {
      product = grid[i][j] * grid[i][j - 1] * grid[i][j - 2] * grid[i][j - 3];
      if (max_product < product) {
        max_product = product;
      }
    }
  }
  for (i = 0; i < 17; ++i) {
    for (j = 0; j < 17; ++j) {
      product = grid[i][j] * grid[i + 1][j + 1] * grid[i + 2][j + 2] * grid[i + 3][j + 3];
      if (max_product < product) {
        max_product = product;
      }
    }
  }
  for (i = 3; i < 20; ++i) {
    for (j = 0; j < 17; ++j) {
      product = grid[i][j] * grid[i - 1][j + 1] * grid[i - 2][j + 2] * grid[i - 3][j + 3];
      if (max_product < product) {
        max_product = product;
      }
    }
  }
  printf("%ld", max_product);
  return 0;
}
```