#include <stdio.h> #include <math.h> int main() { double n = 0.00; int m = 0; while (~scanf("%lf %d", &n, &m)) { double sum = 0.00;//这里不能用float,只能用double for (int i = 0; i < m; i++)//控制m次 { sum += n; n = sqrt(n); } printf("%.2lf\n", sum); } return 0; }