题解 | 小红的正整数构造
小红的正整数构造
https://www.nowcoder.com/practice/7aa37cbc28034fe5af562ec7e44d1e76
l,r,x = map(int,input().split())
temp = x
while 1:
if l<=temp<=r:
print(temp)
break
elif temp > r:
print(-1)
break
temp += x