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2024-10-30 22:11:36 +08:00
#include <math.h>
#include <stdio.h>
int main() {
double x;
scanf("%lf", &x);
if (x < 1) {
printf("%.3lf\n", x);
} else if (1 <= x && x < 10) {
printf("%.3lf\n", sqrt(x * 2 - 1));
} else { // x >= 10
printf("%.3lf\n", log(x * 3 - 11));
}
return 0;
}