void cycle_input(ifstream& file)
{
	if(file.eof())
		file.seekg(0, ios_base::beg);
}

void main()
{

	ifstream fin( "1.txt" ); 
	ifstream fim( "2.txt" ); 
	ifstream fib( "3.txt" ); 

	string mlstr; 
	string mainstr; 
	string str_name; 

	do 
	{ 
		getline( fib, str_name ); 

		getline( fin, mainstr ); 
		cycle_input(fin);

		getline( fim, malstr ); 
		cycle_input(fim);

		somefunction(str_name, mainstr, malstr); 
	} 
	while(!fib.eof());
}