时间限制: 2s
内存限制: 192MB 提交: 3361 解决: 2392
题目描述
给出一个等差数列的前两项a1，a2，求第n项是多少。
输入格式
一行，包含三个整数a1，a2，n。-100 <= a1,a2 <= 100，0 < n <= 1000。
提示
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