#include <ctime>
#include <cstdio>
#include <algorithm>
#include <iostream>

using namespace std;

/** Interface */

inline int readInt();
inline int readUInt();
inline void readWord( char *s );
inline int fast_readchar(); // you may use readchar() instead of it

/** Read */

static const int buf_size = 4096;

inline int fast_readchar() {
  static char buf[buf_size];
  static int len = 0, pos = 0;
  if (pos == len)
    pos = 0, len = fread(buf, 1, buf_size, stdin);
  if (pos == len)
    return -1;
  return buf[pos++];
}

inline int readUInt() {
  int c = fast_readchar(), x = 0;
  while (c <= 32)
    c = fast_readchar();
  while ('0' <= c && c <= '9')
    x = x * 10 + c - '0', c = fast_readchar();
  return x;
}

inline int readInt() {
  int s = 1, c = fast_readchar();
  int x = 0;
  while (c <= 32)
    c = fast_readchar();
  if (c == '-')
    s = -1, c = fast_readchar();
  while ('0' <= c && c <= '9')
    x = x * 10 + c - '0', c = fast_readchar();
  return x * s;
}

inline void readWord( char *s ) { 
  int c = fast_readchar();
  while (c <= 32)
    c = fast_readchar();
  while (c > 32)
    *s++ = c, c = fast_readchar();
  *s = 0;
}

const int N = 1e7 + 1;
char s[N], t[N];
int main() {
  while (fast_readchar() != -1)
    ;
  printf("%.2f\n", 1. * clock() / CLOCKS_PER_SEC);
}