#include <stdio.h>
#include <math.h>

int main() {
    int x,y,z,x1,y1,z2;
	double z1;
    int result;

	scanf("%d %d %d",&x,&y,&z);

	x1 = abs(x);
	y1 = abs(y);
	z1 = sqrt(2.0)*(double)z;
	z2 = (int)z1;
	result = x1 + y1 + z2 + 1;

	printf("%d\n",result);


    return 0;
}