import java.util.Arrays;
 
class Foo {
    int x;
    public Foo(int x) {
        this.x = x;
    }
    private int add(int... args) {
        return Arrays.stream(args).reduce(this.x, (accum, value) -> accum + value);
    }
    private int sub(int... args) {
        return Arrays.stream(args).reduce(this.x, (accum, value) -> accum - value);
    }
    private int mul(int... args) {
        return Arrays.stream(args).reduce(this.x, (accum, value) -> accum * value);
    }
    private int div(int... args) {
        return Arrays.stream(args).reduce(this.x, (accum, value) -> accum / value);
    }
}
 

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