#include<stdio.h>
#include<math.h>
int main()
{
    float initial;
    int n;
    float n1,n2,n3;
    scanf("%f",&initial);
    scanf("%d",&n);
    scanf("%f",&n1);
    scanf("%f",&n2);
    scanf("%f",&n3);
  float sum;
  sum=initial+n1(-n2)+n3;
  printf("%.2f",sum);
  return 0;
}