const a = 6;
t0 = 18;
t1 = 706;
s = 0.776;
v = 0.056;
k = 0.00448;
var t, t2 :real;
begin
t := t0 + (t1-t0)*exp(-(k*s*a)/v);
t2 := ( 6.25* (t0+(t1-t0)*exp(-(k*s*(a+0.25))/v))) / 6;
writeln(t2-t:10:4);
end.
const a = 6;
t0 = 18;
t1 = 706;
s = 0.776;
v = 0.056;
k = 0.00448;
var t, t2 :real;
begin
t := t0 + (t1-t0)*exp(-(k*s*a)/v);
t2 := ( 6.25* (t0+(t1-t0)*exp(-(k*s*(a+0.25))/v))) / 6;
writeln(t2-t:10:4);
end.