chutzpah

题目链接有一个序列是这样定义的：f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. 给出A，B和N，求f(n)的值。Input输入3个数：A,B,N。数字之间用空格分割。(-10000 <= A, B <= 10000, 1 <= N <= 10^9) Output 输出f(n)的值。Input示例3 -1 5Outp