#include <stdio.h>
#include <math.h>
int main(void)
{
long a, b, c, d;
long t_a, t_b, t_c, t_d;
while(1)
{
int Count = 0;
scanf("%d %d %d %d", &a, &b, &c, &d);
if(a == 0 && b == 0 && c == 0 && d == 0)
{
break;
}
do
{
t_a = abs(a-b);
t_b = abs(b-c);
t_c = abs(c-d);
t_d = abs(d-a);
if((t_a == t_b) && (t_b == t_c) && (t_c == t_d))
break;
else
Count++;
a = t_a;
b = t_b;
c = t_c;
d = t_d;
}while(1);
printf("%d₩n", Count);
}
return 0;
}
#include <math.h>
int main(void)
{
long a, b, c, d;
long t_a, t_b, t_c, t_d;
while(1)
{
int Count = 0;
scanf("%d %d %d %d", &a, &b, &c, &d);
if(a == 0 && b == 0 && c == 0 && d == 0)
{
break;
}
do
{
t_a = abs(a-b);
t_b = abs(b-c);
t_c = abs(c-d);
t_d = abs(d-a);
if((t_a == t_b) && (t_b == t_c) && (t_c == t_d))
break;
else
Count++;
a = t_a;
b = t_b;
c = t_c;
d = t_d;
}while(1);
printf("%d₩n", Count);
}
return 0;
}
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