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#include <stdio.h>
int min2(int a, int b) {
if (a < b) return a;
return b;
}
int min3(int a, int b, int c) {
return min2(min2(a, b), c);
}
int readsides(int* length, int* width, int* height) {
return scanf("%dx%dx%d", length, width, height);
}
void calcsides(int length, int width, int height, int* side1, int* side2, int* side3) {
(*side1) = length * width;
(*side2) = width * height;
(*side3) = height * length;
}
int main() {
int length, width, height;
int side1, side2, side3;
int area, totalarea = 0;
while (readsides(&length, &width, &height) > 0) {
calcsides(length, width, height, &side1, &side2, &side3);
area = 2*side1 + 2*side2 + 2*side3 + min3(side1, side2, side3);
totalarea += area;
}
printf("%d\n", totalarea);
return 0;
}
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