def is_prime(a):
    if a>1:
        for i in range(2,a):
            if (a%i)==0:
                return False
            else:
                None
        return True
n=int(input())
if __name__=='__main__':
    print(is_prime(n))
#ans in true or false

def prime(a):
    if a>1:
        for i in range(2,a):
            if (a%i)==0:
                return False
            else:
                None
        return True
def is_prime(b):
    sum=0
    for j in range(0,b+1):
        if prime(j)==True:
            sum +=j
    return sum
            
    
n=int(input())
if __name__=='__main__':
    print(is_prime(n))