/*
#include <stdio.h>
int main()
{
printf("aa");
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
printf("Hello");
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
printf("Hello World");
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
printf("Hello\nWorld");
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
printf("\'Hello\'");
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
printf("\"Hello World\"");
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
printf("\"!@#$%%^&*()\"");
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
printf("\"C:\\Download\\hello.cpp\"");
return 0;
}
*/
/*
정수형
int %d <<<
long long int %lld
실수형
float %f
double %lf <<<
문자형
char %c <<<
----------------------------------
1 bit
1 bit * 8 = 8 bit = 1 Byte
1Byte * 1024 = 1 KB
1 KB * 1024 = 1 MB
1 MB * 1024 = 1 GB
> K > M > G > T > P
int 4 Byte = 32 bit
2^32 =
-2^31 ~ +2^31-1
> -2147483648 ~ +2147483647
> Overflow: Error
long long 8 Byte = 64 bit
> -922~ +922
*/
/*
#include<stdio.h>
int main() {
int x, y;
scanf("%d %d", &x, &y);
printf("%d", x+y);
return 0;
// x = 10;
//// 10 = x;
// x = 10 + x;
//
// printf("%d\n", x);
// x = 10 + x;
// printf("%d\n", x);
}
*/
// 1010, 1011, 1012, 1014, 1019, 1023
/*
int main()
{
int n;
scanf("%d",&n);
printf("%d",n);
return 0;
}
*/
/*
char main()
{
char x;
scanf("%c",&x);
printf("%c",x);
return 0;
}
*/
/*
float main()
{
float x;
scanf("%f",&x);
printf("%f",x);
return 0;
}
*/
/*
char main()
{
char x, y;
scanf ("%c %c",&x,&y);
printf("%c %c", y,x);
return 0;
}
*/
/*
# include <stdio.h>
int main()
{
int a,b,c;
scanf("%d.%d.%d",&a,&b,&c);
printf("%04d.%02d.%02d", a,b,c);
return 0;
}
*/
/*
#include <stdio.h>
int main()
{
int a,b;
scanf("%d.%d",&a,&b);
printf("%d\n%d", a,b);
return 0;
}
*/
/*
산술연산자
+, -, *, /, %
+: warning
Overflow
20억 + 20억? = 40?error
+2147483647 + 1 =
-2147483648
/:
정수 / 정수 = 정수
5 / 2 = 2(몫)
1. 실수 / 정수, 정수 / 실수
2. 강제 형변환
a / b = 몫
(double)a / b = 실수
%: 나머지
printf("%.3lf", (double)a/b);
*/
/*
#include <stdio.h>
int main()
{
int a,b;
scanf("%d %d",&a,&b);
printf("%d+%d=%d\n",a,b,a+b);
printf("%d-%d=%d\n",a,b,a-b);
printf("%d*%d=%d\n",a,b,a*b);
printf("%d/%d=%d\n",a,b,a/b);
return 0;
}
*/
#include <stdio.h>
double main()
{
double a,b;
scanf("%lf %lf",&a,&b);
printf("%.2lf",a*b);
return 0;
}