#include<stdio.h>
int main()
{
  float initial;
  int n;
  float transaction;
  scanf("%f,&initial");
  scanf("%f,&n");
  for(int i=0;i<n;i++){
      scanf("%f,&transaction");
      intial+=transaction;
  }
  printf(%.2f,intial);
  return 0;
}