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1300. Painter
单点时限: 2.0 sec
内存限制: 256 MB
Write a program that:
1.reads the sizes of two matrices and the numbers of columns and rows that the upper matrix should be shifted by;
2.computes the number of yellow stains on the canvas;
3.writes the result.
输入格式
There is one integer n, 0<=n<=100 in the first line of the file MAL.IN. This number is the size of matrices used for production of paintings. In the second line there is one integer x and in the third line one integer y, where 0<=x,y<=2^n. The integer x is the number of columns and y is the number of rows that the upper matrix should be shifted by.
输出格式
In the first line of the output file there should be written the number of stains on the canvas.
样例
Input
2 2 2
Output
3
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