/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.function.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Operarray {
    public static long sum(long a, long b) {
        return a + b;
    }
 
    private static void func(BiFunction<Long, Long, Long> f1) {
        System.out.println(f1.apply(1L, 2L));
    }
 
    public static void main(String[] args) {
        func(Operarray::sum);
    }
}

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