馃煝聽諑铡謤摘崭謧诈盏崭謧斩 3
猿謤榨宅 债謤铡眨斋謤炸, 崭謤炸 沾崭謧湛謩崭謧沾 战湛铡斩崭謧沾 乍 4 战铡瞻崭詹 寨榨湛崭站 诈站榨謤 謬 乍寨謤铡斩斋斩 湛蘸崭謧沾 乍 铡盏栅 诈站榨謤斋 沾斋栈斋斩 诈站铡闸铡斩铡寨铡斩 铡謤摘榨謩炸謮
#include <iostream>
int main() {
double a, b, c, d;
std::cin >> a >> b >> c >> d;
// your code here
}聽
Constraints
Time limit: 1 seconds
Memory limit: 512 MB
Output limit: 1 MB