P = [i for i in range(10**6)]
for i in range(2,1001):
    for j in range(i**2,10**6,i):
        P[j]=P[i]
Q = []
for i in range(10**5,10**6):
    if P[i]==i:
        Q.append(i)
        if len(Q)==6:break
A = []
for i in range(5):
    for j in range(i,6):
        A.append(Q[i]*Q[j])
A = sorted(A)
A.insert(0,1)
N = int(input())
print(A[N-1])