#include <stdio.h>
int main() {
int a1, a2, a3, a4, a5;
scanf ("%d %d %d %d %d", &a1, &a2, &a3, &a4, &a5);
float avg = (a1 + a2 + a3 + a4 + a5) / 5.00;
int min = a1;
int arr[] = {a1, a2, a3, a4, a5};
int count = 0;
for (int i = 0; i < 5; i++) {
if (arr[i] < 0 || arr[i] > 100) {
printf("Invalid");
return 0;
}
// return 0; 위치 주의하기!
}
for (int i = 0; i < 5; i++) {
if (arr[i] < 40) {
count++;
}
}
if (count >= 3) {
printf("F\n");
}
else {
if (avg >= 90) {
printf("A+\n");
}
else if (avg >= 75) {
printf("A\n");
}
else if (avg >= 65) {
printf("B+\n");
}
else if (avg >= 50) {
printf("B\n");
}
else {
printf("F\n");
}
}
if (min > a2) {
min = a2;
}
if (min > a3) {
min = a3;
}
if (min > a4) {
min = a4;
}
if (min > a5) {
min = a5;
}
printf("avg=%.2f min=%d", avg, min);
return 0;
}
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