#include <iostream>
#include <cstddef>
 
typedef float Float;
 
void doStuff(double a, double b, double c, std::size_t precision = 32) {
  const Float part = a + b;
  const Float result = part + c;
 
  std::cout.precision(precision);
  std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield);
  std::cout << "      a = " << a << '\n'
            << "      b = " << b << '\n'
            << "    a+b = " << part << '\n'
            << "      c = " << c << '\n'
            << "(a+b)+c = " << result << '\n' << '\n';
}
 
int main() {
  Float a, b, c;
 
  while (std::cin >> a >> b >> c) {
    doStuff(a, b, c);
  }
}
 

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0.4 0.1 0.1
0.1 0.1 0.4