#include<stdio.h>
#include<math.h>
int main()
{
double x1, x2, y1, y2,distance;
scanf_s("%lf%lf%lf%lf", &x1, &y1, &x2, &y2);
printf("%.2f", sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2)));
return 0;
}
慕田峪6141110
onemoo
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暗域天堂
无为自然
慕工程6039471
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