20240412

# n=int(input())# for i in range(1,n+1):#     print(i,end=' ')# a,b=map(int,input().split())# if a>b:#     a, b = b, a## for i in range(a,b+1):#     print(i,end=' ')# a,b=input().split()# for i in range(ord(a), ord(b)+1):#     print(chr(i),end=' ')# a=int(input())# for i in range(a):#     print('*',end='')# a,b=map(int,input().split())# for i in range(a,b+1):#     if i%2==1:#         print(i,end=' ')# n=int(input())# c=0# for i in range(n):#     c+=i# print(c+n)# n=int(input())# c=0# for i in range(n+1):#     if i%2==0:#         c+=i# print(c)# a,b=map(int,input().split())# c=0# for i in range(a,b+1):#     if i%3==0:#         c+=i# print(c)# z=list(map(int,input().split()))# s=0# c=0# d=0# for i in range(10):#     if z[i]!=0:#         d=z[i]#     if d%5==0 and z[i]!=0:#         print(d)#         c=d#         break# if c==0:#     print('0')# a=int(input())# for i in range(1,10):#     print(a,'*',i,'=',a*i,sep='')# b=int(input())# n=list(map(int,input().split()))# c=0# for i in range(b):#    c+=n[i]# print(c)# n = int(input())## data = list(map(int, input().split()))# s=0# for i in range(n):#     if data[i]%5==0 and data[i]!=0:#         s+=data[i]# print(s)# n=int(input())# a=list(map(int,input().split()))# s=0# for i in range(n):#     if a[i]%2==1:#         s+=1# print(s)a,b,c,n=map(int,input().split())d=a*b+cfor i in range(1,10):    if n==1:        print(a)        break    elif n%2==1:        print(d*b+c)        break    elif n%2==0:        print(a)        break;