题解 | #牛牛的快递#

#include <stdio.h>

int main() {
	float a = 0.0f;
	char b = 0;
	int cost = 20;
	scanf("%f %c", &a, &b);  //输入格式两者间要有空格，不然空格会被字符变量吸收导致无法接受'n'或'y'

	if (a > 1) {
		if (a == (int)a)
			cost += a - 1;
		else
			cost += a;
	}
		
	if (b == 'y')
		cost += 5;

	printf("%d", cost);

	return 0;
}