#include <stdio.h>
#include <stdint.h>

uint64_t f_u_rca4(uint64_t a, uint64_t b){
  uint8_t out = 0;
  uint8_t a_0 = 0;
  uint8_t a_1 = 0;
  uint8_t a_2 = 0;
  uint8_t a_3 = 0;
  uint8_t b_0 = 0;
  uint8_t b_1 = 0;
  uint8_t b_2 = 0;
  uint8_t b_3 = 0;
  uint8_t f_u_rca4_ha_a_0 = 0;
  uint8_t f_u_rca4_ha_b_0 = 0;
  uint8_t f_u_rca4_ha_y0 = 0;
  uint8_t f_u_rca4_ha_y1 = 0;
  uint8_t f_u_rca4_fa1_a_1 = 0;
  uint8_t f_u_rca4_fa1_b_1 = 0;
  uint8_t f_u_rca4_fa1_y0 = 0;
  uint8_t f_u_rca4_fa1_y1 = 0;
  uint8_t f_u_rca4_fa1_f_u_rca4_ha_y1 = 0;
  uint8_t f_u_rca4_fa1_y2 = 0;
  uint8_t f_u_rca4_fa1_y3 = 0;
  uint8_t f_u_rca4_fa1_y4 = 0;
  uint8_t f_u_rca4_fa2_a_2 = 0;
  uint8_t f_u_rca4_fa2_b_2 = 0;
  uint8_t f_u_rca4_fa2_y0 = 0;
  uint8_t f_u_rca4_fa2_y1 = 0;
  uint8_t f_u_rca4_fa2_f_u_rca4_fa1_y4 = 0;
  uint8_t f_u_rca4_fa2_y2 = 0;
  uint8_t f_u_rca4_fa2_y3 = 0;
  uint8_t f_u_rca4_fa2_y4 = 0;
  uint8_t f_u_rca4_fa3_a_3 = 0;
  uint8_t f_u_rca4_fa3_b_3 = 0;
  uint8_t f_u_rca4_fa3_y0 = 0;
  uint8_t f_u_rca4_fa3_y1 = 0;
  uint8_t f_u_rca4_fa3_f_u_rca4_fa2_y4 = 0;
  uint8_t f_u_rca4_fa3_y2 = 0;
  uint8_t f_u_rca4_fa3_y3 = 0;
  uint8_t f_u_rca4_fa3_y4 = 0;

  a_0 = ((a >> 0) & 0x01);
  a_1 = ((a >> 1) & 0x01);
  a_2 = ((a >> 2) & 0x01);
  a_3 = ((a >> 3) & 0x01);
  b_0 = ((b >> 0) & 0x01);
  b_1 = ((b >> 1) & 0x01);
  b_2 = ((b >> 2) & 0x01);
  b_3 = ((b >> 3) & 0x01);
  f_u_rca4_ha_a_0 = ((a_0 >> 0) & 0x01);
  f_u_rca4_ha_b_0 = ((b_0 >> 0) & 0x01);
  f_u_rca4_ha_y0 = f_u_rca4_ha_a_0 ^ f_u_rca4_ha_b_0;
  f_u_rca4_ha_y1 = f_u_rca4_ha_a_0 & f_u_rca4_ha_b_0;
  f_u_rca4_fa1_a_1 = ((a_1 >> 0) & 0x01);
  f_u_rca4_fa1_b_1 = ((b_1 >> 0) & 0x01);
  f_u_rca4_fa1_f_u_rca4_ha_y1 = ((f_u_rca4_ha_y1 >> 0) & 0x01);
  f_u_rca4_fa1_y0 = f_u_rca4_fa1_a_1 ^ f_u_rca4_fa1_b_1;
  f_u_rca4_fa1_y1 = f_u_rca4_fa1_a_1 & f_u_rca4_fa1_b_1;
  f_u_rca4_fa1_y2 = f_u_rca4_fa1_y0 ^ f_u_rca4_fa1_f_u_rca4_ha_y1;
  f_u_rca4_fa1_y3 = f_u_rca4_fa1_y0 & f_u_rca4_fa1_f_u_rca4_ha_y1;
  f_u_rca4_fa1_y4 = f_u_rca4_fa1_y1 | f_u_rca4_fa1_y3;
  f_u_rca4_fa2_a_2 = ((a_2 >> 0) & 0x01);
  f_u_rca4_fa2_b_2 = ((b_2 >> 0) & 0x01);
  f_u_rca4_fa2_f_u_rca4_fa1_y4 = ((f_u_rca4_fa1_y4 >> 0) & 0x01);
  f_u_rca4_fa2_y0 = f_u_rca4_fa2_a_2 ^ f_u_rca4_fa2_b_2;
  f_u_rca4_fa2_y1 = f_u_rca4_fa2_a_2 & f_u_rca4_fa2_b_2;
  f_u_rca4_fa2_y2 = f_u_rca4_fa2_y0 ^ f_u_rca4_fa2_f_u_rca4_fa1_y4;
  f_u_rca4_fa2_y3 = f_u_rca4_fa2_y0 & f_u_rca4_fa2_f_u_rca4_fa1_y4;
  f_u_rca4_fa2_y4 = f_u_rca4_fa2_y1 | f_u_rca4_fa2_y3;
  f_u_rca4_fa3_a_3 = ((a_3 >> 0) & 0x01);
  f_u_rca4_fa3_b_3 = ((b_3 >> 0) & 0x01);
  f_u_rca4_fa3_f_u_rca4_fa2_y4 = ((f_u_rca4_fa2_y4 >> 0) & 0x01);
  f_u_rca4_fa3_y0 = f_u_rca4_fa3_a_3 ^ f_u_rca4_fa3_b_3;
  f_u_rca4_fa3_y1 = f_u_rca4_fa3_a_3 & f_u_rca4_fa3_b_3;
  f_u_rca4_fa3_y2 = f_u_rca4_fa3_y0 ^ f_u_rca4_fa3_f_u_rca4_fa2_y4;
  f_u_rca4_fa3_y3 = f_u_rca4_fa3_y0 & f_u_rca4_fa3_f_u_rca4_fa2_y4;
  f_u_rca4_fa3_y4 = f_u_rca4_fa3_y1 | f_u_rca4_fa3_y3;

  out |= (f_u_rca4_ha_y0 & 0x01) << 0;
  out |= (f_u_rca4_fa1_y2 & 0x01) << 1;
  out |= (f_u_rca4_fa2_y2 & 0x01) << 2;
  out |= (f_u_rca4_fa3_y2 & 0x01) << 3;
  out |= (f_u_rca4_fa3_y4 & 0x01) << 4;
  return out;
}