from random import *
def f(x):
    return x**2-3*x+5
def monte_carlo(f,a,b,M,n):
    S = 0
    for k in range(n):
        (x,y) = (a+(b-a)*random(),M*random())
        if y < f(x):
            S += 1
    return S/n*M*(b-a)