Language: C

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Sparsh Sanchorawala
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        ALucky7 solver = new ALucky7();
        solver.solve(1, in, out);
        out.close();
    }

    static class ALucky7 {
        public void solve(int testNumber, InputReader s, PrintWriter w) {
            int n = s.nextInt();
            int flag = 0;
            while (n > 0) {
                if (n % 10 == 7)
                    flag = 1;
                n /= 10;
            }
            if (flag == 1)
                w.println("Yes");
            else
                w.println("No");
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') {
                    throw new InputMismatchException();
                }
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
}



Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.io.OutputStream;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.io.OutputStream;
      |            ^
main.c:2:1: error: unknown type name 'import'
    2 | import java.io.IOException;
      | ^~~~~~
main.c:2:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | import java.io.IOException;
      |            ^
main.c:3:1: error: unknown type name 'import'
    3 | import java.io.InputStream;
      | ^~~~~~
main.c:3:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    3 | import java.io.InputStream;
      |            ^
main.c:4:1: error: unknown type name 'import'
    4 | import java.io.PrintWriter;
      | ^~~~~~
main.c:4:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    4 | import java.io.PrintWriter;
      |            ^
main.c:5:1: error: unknown type name 'import'
    5 | import java.util.InputMismatchException;
      | ^~~~~~
main.c:5:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    5 | import java.util.InputMismatchException;
      |            ^
main.c:6:1: error: unknown type name 'import'
    6 | import java.io.IOException;
      | ^~~~~~
main.c:6:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    6 | import java.io.IOException;
      |            ^
main.c:7:1: error: unknown type name 'import'
    7 | import java.io.InputStream;
      | ^~~~~~
main.c:7:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    7 | import java.io.InputStream;
      |            ^
main.c:15:1: error: unknown type name 'public'
   15 | public class Main {
      | ^~~~~~
main.c:15:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Main'
   15 | public class Main {
      |              ^~~~