#include <stdio.h>
#include <stdlib.h>

float parallel( float x, float y );

int main( int argc, char *argv[] )
{
    float a = 1.0, b = 1.0, c;

    if( argc > 1 ) {
        a = strtod( argv[1], NULL );
    }
    
    if( argc > 2 ) {
        b = strtod( argv[2], NULL );
    }
    
    c = parallel( a, b );

    printf( "%f\n", c );

    return 0;
}