#include <cstdlib>
#include <iostream>
using namespace std;
int main()
{
int r,s1,s2,s3,b,z;
cin >> r >> s1 >> s2 >> b;
z=s1*5+s2*7+b;
s3=(r-z)/2;
cout << s3;
system(„PAUSE“);
return EXIT_SUCCESS;
}
#include <cstdlib>
#include <iostream>
using namespace std;
int main()
{
int r,s1,s2,s3,b,z;
cin >> r >> s1 >> s2 >> b;
z=s1*5+s2*7+b;
s3=(r-z)/2;
cout << s3;
system(„PAUSE“);
return EXIT_SUCCESS;
}