#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 /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int score;
  scanf("%d", &score);
  switch (score / 10) {
  case 10:
  case 9:
    printf("A");
    break;
  case 8:
    printf("B");
    break;
  case 7:
    printf("C");
    break;
  case 6:
    printf("D");
    break;
  case 5:
  case 4:
  case 3:
  case 2:
  case 1:
  case 0:
    printf("E");
    break;
  default:
    printf("ERROR");
    break;
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xef6(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
movslq -0x8(%rbp),%rax
imul   $0x66666667,%rax,%rax
mov    %rax,%rcx
shr    $0x3f,%rcx
sar    $0x22,%rax
add    %ecx,%eax
mov    %eax,%ecx
mov    %rcx,-0x10(%rbp)
sub    $0xa,%eax
ja     11cf <main+0xaf>
mov    -0x10(%rbp),%rax
lea    0xe8f(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xeae(%rip),%rdi
call   1030 <printf@plt>
jmp    11db <main+0xbb>
lea    0xe9f(%rip),%rdi
call   1030 <printf@plt>
jmp    11db <main+0xbb>
lea    0xe90(%rip),%rdi
call   1030 <printf@plt>
jmp    11db <main+0xbb>
lea    0xe81(%rip),%rdi
call   1030 <printf@plt>
jmp    11db <main+0xbb>
lea    0xe72(%rip),%rdi
call   1030 <printf@plt>
jmp    11db <main+0xbb>
lea    0xe63(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xef4(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
movslq 0x4(%rsp),%rax
imul   $0x66666667,%rax,%rax
mov    %rax,%rcx
shr    $0x3f,%rcx
sar    $0x22,%rax
add    %ecx,%eax
cmp    $0xa,%eax
ja     117e <main+0x4e>
lea    0xe99(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
mov    $0x45,%edi
jmp    119f <main+0x6f>
mov    $0x41,%edi
jmp    119f <main+0x6f>
lea    0xeaa(%rip),%rdi
call   1040 <printf@plt>
jmp    11a4 <main+0x74>
mov    $0x44,%edi
jmp    119f <main+0x6f>
mov    $0x43,%edi
jmp    119f <main+0x6f>
mov    $0x42,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [2 x i8] c"A\00"
@.str.2 = [2 x i8] c"B\00"
@.str.3 = [2 x i8] c"C\00"
@.str.4 = [2 x i8] c"D\00"
@.str.5 = [2 x i8] c"E\00"
@.str.6 = [6 x i8] c"ERROR\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
%4 = load i32, i32* %2
%5 = sdiv i32 %4, 10
switch i32 %5, label %16 [
i32 10, label %6
i32 9, label %6
i32 8, label %8
i32 7, label %10
i32 6, label %12
i32 5, label %14
i32 4, label %14
i32 3, label %14
i32 2, label %14
i32 1, label %14
i32 0, label %14
]
6: ; preds = %0, %0
%7 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %18
8: ; preds = %0
%9 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %18
10: ; preds = %0
%11 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
br label %18
12: ; preds = %0
%13 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
br label %18
14: ; preds = %0, %0, %0, %0, %0, %0
%15 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0))
br label %18
16: ; preds = %0
%17 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0))
br label %18
18: ; preds = %16, %14, %12, %10, %8, %6
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%d\00"
@.str.6 = [6 x i8] c"ERROR\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %1)
%4 = load i32, i32* %1
%5 = sdiv i32 %4, 10
switch i32 %5, label %16 [
i32 10, label %6
i32 9, label %6
i32 8, label %8
i32 7, label %10
i32 6, label %12
i32 5, label %14
i32 4, label %14
i32 3, label %14
i32 2, label %14
i32 1, label %14
i32 0, label %14
]
6: ; preds = %0, %0
%7 = call i32 @putchar(i32 65)
br label %18
8: ; preds = %0
%9 = call i32 @putchar(i32 66)
br label %18
10: ; preds = %0
%11 = call i32 @putchar(i32 67)
br label %18
12: ; preds = %0
%13 = call i32 @putchar(i32 68)
br label %18
14: ; preds = %0, %0, %0, %0, %0, %0
%15 = call i32 @putchar(i32 69)
br label %18
16: ; preds = %0
%17 = call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.6, i64 0, i64 0))
br label %18
18: ; preds = %16, %14, %12, %10, %8, %6
ret i32 0
}