#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int atoi(char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, long);
int /*<<< orphan*/ stderr;
long tribonacci_num(int);
int main(int argc, char **argv) {
  if (argc != 2) {
    fprintf(stderr, "usage: %s <N>\n", argv[0]);
    return 1;
  }
  int N = atoi(argv[1]);
  if (N < 1)
    return 1;
  long count = 0;
  count += tribonacci_num(N);
  for (int late_day = 1; late_day <= N; late_day++)
    count += tribonacci_num(N - late_day) * tribonacci_num(late_day - 1);
  printf("%ld\n", count);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
je     1188 <main+0x48>
mov    0x2e79(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe89(%rip),%rsi
call   1040 <fprintf@plt>
movl   $0x1,-0x4(%rbp)
jmp    122b <main+0xeb>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1060 <atoi@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x1,-0x14(%rbp)
jge    11ae <main+0x6e>
movl   $0x1,-0x4(%rbp)
jmp    122b <main+0xeb>
movq   $0x0,-0x20(%rbp)
mov    -0x14(%rbp),%edi
call   1050 <tribonacci_num@plt>
add    -0x20(%rbp),%rax
mov    %rax,-0x20(%rbp)
movl   $0x1,-0x24(%rbp)
mov    -0x24(%rbp),%eax
cmp    -0x14(%rbp),%eax
jg     1214 <main+0xd4>
mov    -0x14(%rbp),%edi
sub    -0x24(%rbp),%edi
call   1050 <tribonacci_num@plt>
mov    %rax,-0x30(%rbp)
mov    -0x24(%rbp),%edi
sub    $0x1,%edi
call   1050 <tribonacci_num@plt>
mov    %rax,%rcx
mov    -0x30(%rbp),%rax
imul   %rcx,%rax
add    -0x20(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x24(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x24(%rbp)
jmp    11cd <main+0x8d>
mov    -0x20(%rbp),%rsi
lea    0xdf0(%rip),%rdi
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
cmp    $0x2,%edi
jne    11a3 <main+0x63>
mov    0x8(%rsi),%rdi
call   1060 <atoi@plt>
test   %eax,%eax
jle    11bb <main+0x7b>
mov    %eax,%ebx
mov    %eax,%edi
call   1050 <tribonacci_num@plt>
mov    %rax,%r14
add    $0xffffffff,%ebx
xor    %ebp,%ebp
nopw   0x0(%rax,%rax,1)
mov    %ebx,%edi
call   1050 <tribonacci_num@plt>
mov    %rax,%r15
mov    %ebp,%edi
call   1050 <tribonacci_num@plt>
imul   %r15,%rax
add    %rax,%r14
add    $0x1,%ebp
add    $0xffffffff,%ebx
jb     1170 <main+0x30>
lea    0xe78(%rip),%rdi
mov    %r14,%rsi
call   1030 <printf@plt>
xor    %eax,%eax
jmp    11c0 <main+0x80>
mov    0x2e36(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe4a(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [15 x i8] c"usage: %s <N>\0A\00"
@.str.1 = [5 x i8] c"%ld\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i64
%8 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%9 = load i32, i32* %4
%10 = icmp ne i32 %9, 2
br i1 %10, label %11, label %17
11: ; preds = %2
%12 = load i32, i32* @stderr
%13 = load i8**, i8*** %5
%14 = getelementptr inbounds i8*, i8** %13, i64 0
%15 = load i8*, i8** %14
%16 = call i32 @fprintf(i32 %12, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %15)
store i32 1, i32* %3
br label %51
17: ; preds = %2
%18 = load i8**, i8*** %5
%19 = getelementptr inbounds i8*, i8** %18, i64 1
%20 = load i8*, i8** %19
%21 = call i32 @atoi(i8* %20)
store i32 %21, i32* %6
%22 = load i32, i32* %6
%23 = icmp slt i32 %22, 1
br i1 %23, label %24, label %25
24: ; preds = %17
store i32 1, i32* %3
br label %51
25: ; preds = %17
store i64 0, i64* %7
%26 = load i32, i32* %6
%27 = call i64 @tribonacci_num(i32 %26)
%28 = load i64, i64* %7
%29 = add nsw i64 %28, %27
store i64 %29, i64* %7
store i32 1, i32* %8
br label %30
30: ; preds = %45, %25
%31 = load i32, i32* %8
%32 = load i32, i32* %6
%33 = icmp sle i32 %31, %32
br i1 %33, label %34, label %48
34: ; preds = %30
%35 = load i32, i32* %6
%36 = load i32, i32* %8
%37 = sub nsw i32 %35, %36
%38 = call i64 @tribonacci_num(i32 %37)
%39 = load i32, i32* %8
%40 = sub nsw i32 %39, 1
%41 = call i64 @tribonacci_num(i32 %40)
%42 = mul nsw i64 %38, %41
%43 = load i64, i64* %7
%44 = add nsw i64 %43, %42
store i64 %44, i64* %7
br label %45
45: ; preds = %34
%46 = load i32, i32* %8
%47 = add nsw i32 %46, 1
store i32 %47, i32* %8
br label %30
48: ; preds = %30
%49 = load i64, i64* %7
%50 = call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i64 %49)
store i32 0, i32* %3
br label %51
51: ; preds = %48, %24, %11
%52 = load i32, i32* %3
ret i32 %52
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [15 x i8] c"usage: %s <N>\0A\00"
@.str.1 = [5 x i8] c"%ld\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %8, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0), i8* %6)
br label %28
8: ; preds = %2
%9 = getelementptr inbounds i8*, i8** %1, i64 1
%10 = load i8*, i8** %9
%11 = tail call i32 @atoi(i8* %10)
%12 = icmp slt i32 %11, 1
br i1 %12, label %28, label %13
13: ; preds = %8
%14 = tail call i64 @tribonacci_num(i32 %11)
br label %17
15: ; preds = %17
%16 = tail call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0), i64 %25)
br label %28
17: ; preds = %13, %17
%18 = phi i32 [ 1, %13 ], [ %26, %17 ]
%19 = phi i64 [ %14, %13 ], [ %25, %17 ]
%20 = sub nsw i32 %11, %18
%21 = tail call i64 @tribonacci_num(i32 %20)
%22 = add nsw i32 %18, -1
%23 = tail call i64 @tribonacci_num(i32 %22)
%24 = mul nsw i64 %23, %21
%25 = add nsw i64 %24, %19
%26 = add nuw i32 %18, 1
%27 = icmp eq i32 %11, %18
br i1 %27, label %15, label %17
28: ; preds = %15, %8, %4
%29 = phi i32 [ 1, %4 ], [ 0, %15 ], [ 1, %8 ]
ret i32 %29
}