#include <ctype.h>
#include <stdio.h>

#define MAXLINE 100

int getlime(char s[], int lim)
{
  int ch, i;
  for (i = 0; i < lim - 1 && (ch = getchar()) != EOF && ch != '\n'; ++i)
      s[i] = ch;
  if (ch == '\n') {
    s[i] = ch;
    ++i;
  }
  s[i] = '\0';
  return i;
}

double atof(char s[]) {
  double val, power;
  int ind, sign;

  for (ind = 0; isspace(s[ind]); ++ind) /* skip whitespace */
    ;
  sign = (s[ind] == '-') ? -1 : 1;
  if (s[ind] == '+' || s[ind] == '-')
    ++ind;

  for (val = 0.0; isdigit(s[ind]); ++ind)
    val = 10 * val + (s[ind] - '0');
  if(s[ind] == '.')
    ++ind;
  for (power = 1.0; isdigit(s[ind]); ++ind) {
    val = 10.0 * val + (s[ind] - '0');
    power *= 10;
  }
  return sign * val / power;
}

int main() {
  double sum = 0;
  char line[MAXLINE];

  while (getlime(line, MAXLINE) > 0)
    printf("\t%g\n", sum += atof(line));

  return 0;
}