#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 *, double);
int /*<<< orphan*/ scanf(char *, ...);
int main() {
  int com, i;
  double l, c, total = 0;
  scanf("%d", &com);
  for (i = 0; i < com; i++) {
    scanf("%lf %lf", &l, &c);
    total += (l * c);
  }
  printf("%.1lf\n", total);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x28(%rbp)
lea    0xec2(%rip),%rdi
lea    -0x8(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    119c <main+0x7c>
lea    0xea0(%rip),%rdi
lea    -0x18(%rbp),%rsi
lea    -0x20(%rbp),%rdx
mov    $0x0,%al
call   1040 <scanf@plt>
movsd  -0x18(%rbp),%xmm0
movsd  -0x20(%rbp),%xmm2
movsd  -0x28(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x28(%rbp)
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1150 <main+0x30>
movsd  -0x28(%rbp),%xmm0
lea    0xe63(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x28,%rsp
lea    0xecf(%rip),%rdi
lea    0xc(%rsp),%rsi
xor    %eax,%eax
call   1040 <scanf@plt>
cmpl   $0x0,0xc(%rsp)
jle    11a3 <main+0x83>
xorps  %xmm0,%xmm0
lea    0xeb5(%rip),%r14
lea    0x20(%rsp),%r15
lea    0x18(%rsp),%rbx
xor    %ebp,%ebp
nopw   0x0(%rax,%rax,1)
movsd  %xmm0,0x10(%rsp)
mov    %r14,%rdi
mov    %r15,%rsi
mov    %rbx,%rdx
xor    %eax,%eax
call   1040 <scanf@plt>
movsd  0x20(%rsp),%xmm0
mulsd  0x18(%rsp),%xmm0
movsd  0x10(%rsp),%xmm1
addsd  %xmm0,%xmm1
movsd  %xmm1,0x10(%rsp)
movsd  0x10(%rsp),%xmm0
add    $0x1,%ebp
cmp    0xc(%rsp),%ebp
jl     1160 <main+0x40>
jmp    11a6 <main+0x86>
xorps  %xmm0,%xmm0
lea    0xe5e(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x28,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [8 x i8] c"%lf %lf\00"
@.str.2 = [7 x i8] c"%.1lf\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca double
%5 = alloca double
%6 = alloca double
store i32 0, i32* %1
store double 0.000000e+00, double* %6
%7 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %2)
store i32 0, i32* %3
br label %8
8: ; preds = %18, %0
%9 = load i32, i32* %3
%10 = load i32, i32* %2
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %21
12: ; preds = %8
%13 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), double* %4, double* %5)
%14 = load double, double* %4
%15 = load double, double* %5
%16 = load double, double* %6
%17 = call double @llvm.fmuladd.f64(double %14, double %15, double %16)
store double %17, double* %6
br label %18
18: ; preds = %12
%19 = load i32, i32* %3
%20 = add nsw i32 %19, 1
store i32 %20, i32* %3
br label %8
21: ; preds = %8
%22 = load double, double* %6
%23 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), double %22)
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%d\00"
@.str.1 = [8 x i8] c"%lf %lf\00"
@.str.2 = [7 x i8] c"%.1lf\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca double
%3 = alloca double
%4 = bitcast i32* %1 to i8*
%5 = bitcast double* %2 to i8*
%6 = bitcast double* %3 to i8*
%7 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %1)
%8 = load i32, i32* %1
%9 = icmp sgt i32 %8, 0
br i1 %9, label %10, label %20
10: ; preds = %0, %10
%11 = phi double [ %16, %10 ], [ 0.000000e+00, %0 ]
%12 = phi i32 [ %17, %10 ], [ 0, %0 ]
%13 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), double* %2, double* %3)
%14 = load double, double* %2
%15 = load double, double* %3
%16 = call double @llvm.fmuladd.f64(double %14, double %15, double %11)
%17 = add nuw nsw i32 %12, 1
%18 = load i32, i32* %1
%19 = icmp slt i32 %17, %18
br i1 %19, label %10, label %20
20: ; preds = %10, %0
%21 = phi double [ 0.000000e+00, %0 ], [ %16, %10 ]
%22 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), double %21)
ret i32 0
}