const
x = -2.5;
a = 28.4;
b = 5.7;
var
c: array [1..7] of real;
y: real;
begin
c[1] := exp(x); //e^x
c[2] := 6 * c[1]; //6 * e^x
c[3] := cos(a); //cos(a)
c[4] := b * b; //b^2
c[5] := c[4] * b; //b^3
c[6] := c[3] - c[5]; //cos(a) - b^3
c[7] := c[2] / c[6]; //(6 * e^x) / (cos(a) - b^3)
y := c[7];
writeln(y);
end.