def eratos(b): global prime prime[0]=1 prime[1]=1 for i in range(2,b+1): if(prime[i]>0) : continue for j in range(i*i,b+1,i): prime[j]=1 a = int(input()) b = int(input()) prime=[0 for i in range(b+1)] eratos(b) #print(prime) first=-1 sum=0 for i in range(a,b+1): if prime[i]==0: if first==-1: first=i sum+=i if first==-1: print(-1) else: print(sum) print(first)