#include <iostream>
#include <cmath>
#include <cstdio>
using namespace std;
int main()
{
float a, b, k, x, e, N;
cin >> a >> b >> x >> k >>e;
if (a!=0)
{
(0.8*x/sqrt(fabs(x)));
}
else {
cout << "error";
}
if (k+b!=0)
(pow(sin(x), 2)*a/k+b);
else {
cout << "error";
}
N=0.8*x/sqrt(fabs(x))+((pow(sin(x), 2)*a/k+b+0.87)*sin(x)+pow(e, x));
cout << N;
return 0;
}
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