def calka(x:Double,y:Double,delta:Double,F:Double=>Double) : Double = {
def wew(x:Double, y:Double, delta:Double, F:Double=>Double, acc:Double) : Double = {
if(x>=y) acc
else wew((x+delta),y,delta,F,acc+F(x)*delta)
}
wew(x,y,delta,F,0.0)
}