#include <iostream>
#include <cmath>
using namespace std;
int main()
{ float N,a,x,k,b;
cin>>a>>x>>k>>b;
if (a!=0)
{
float N=(0.8/sqrt(abs(a)))+(pow ( sin(x*a),2)/(k+6)+0.87*sin(x))+exp(x);
cout <<"N=" <<N;
}
else cout <<"Error N=" ;
return 0;
}
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