#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  char line[1024];
  double cumsum = 0;

  while (fgets(line, sizeof(line), stdin)) {
    if ((line[0] >= '0' && line[0] <= '9') || line[0] == '.') {
      cumsum += atof(line);
      printf("%f\n", cumsum);
    }
  }
}