#!/usr/bin/env python3

# pylint: disable=superfluous-parens
# superfluous-parens: parens are good for portability and clarity

"""Compute the sum of numbers on stdin."""

import sys
import decimal


def main():
    """Total numbers on stdin."""
    total = decimal.Decimal(0)
    for line in (line_.rstrip('\n') for line_ in sys.stdin):
        try:
            number = decimal.Decimal(line)
        except decimal.InvalidOperation:
            print(f'{line} did not convert to Decimal - skipping', file=sys.stderr)
            continue
        total += number
    print(total)


main()