// editor2
#include<stdio.h>
int main()
{
    int n;
    float initial balance;
    float b,float final,float c,float d;
    scanf("%d",&n);
    scanf("%.2f",&initial balance);
    scanf("%.2f",&b);
    scanf("%.2f",&c);
    scanf("%.2f",,&d);
    final=a+n+b-c+d;
    printf("%.2f",final);
   return 0; 
}