Paint3D#25

Paint3D

1 second

64 megabytes

Easy

Suppose you have an image of a single unit cube on a sheet. Using only selection, full copy, paste, and move (dragging) operations in the graphic editor PAINT, what is the minimum number of such operations required to construct a rectangular parallelepiped of size $A \times B \times C$ A \times B \times C from these cubes?

Input

The input contains the numbers $A$ , $B$ , $C$ . $1 \leq A, B, C \leq 100$ 1 \leq A, B, C \leq 100.

Output

Output the minimal number of operations required.

Examples

Example 1

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A \times B \times C

1 \leq A, B, C \leq 100