题解 | 清楚姐姐买竹鼠
清楚姐姐买竹鼠
https://www.nowcoder.com/practice/816dfe69f83042108cf8c74531a94a35
a,b,x = map(int,input().split())
dan = x%3
ju = x//3
if a<=b/3:
min = x*a
elif a>b and dan != 0:
min = (ju+1)*b
elif a>b and dan == 0:
min = (ju)*b
else:
min = dan*a + ju*b
print(min)
