题解 | #KiKi算期末成绩#

#include<stdio.h>
int main() {
    double a, b, c, d;
    double s;
    while (scanf("%lf %lf %lf %lf", &a, &b, &c, &d) != EOF) {
        s = 0.2 * a + 0.1 * b + 0.2 * c + 0.5 * d;
        printf("%.1f", s);
    }
    return 0;
}