P=[1 for i in range(10**5+200)]
P[0]=0
P[1]=0
for i in range(2,len(P)):
    if P[i]==1:
        for j in range(2,len(P)):
            if i*j<len(P):
                P[i*j]=0
            else:
                break
#print(P)
ans=[1]
for i in range(10**5,len(P)):
    if P[i]==1:
        ans.append(i)
        if len(ans)==10:
            break
N=int(input())
print(ans[N-1])