/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s = "3.5.6.7";
		System.out.println(myParseFloat(s));
	}
 
	public static float myParseFloat(String str) {
		int firstDot = str.indexOf('.');
		if (firstDot != -1) {
			int secondDot = str.indexOf('.', firstDot+1);
			return Float.parseFloat(secondDot == -1 ? str : str.substring(0,secondDot));
		}
		return Float.parseFloat(str);
	}
}

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