unittest
{
	assert( [ "13 3 1" ].parse.expand.solve == 3 );
	assert( [ "12 3 1" ].parse.expand.solve == 2 );
	assert( [ "100000 1 1" ].parse.expand.solve == 49999 );
	assert( [ "64146 123 456" ].parse.expand.solve == 110 );
	assert( [ "64145 123 456" ].parse.expand.solve == 109 );
}



import std.conv;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

void main()
{
	stdin.byLineCopy.parse.expand.solve.writeln;
}

auto parse( Range )( Range input )
if( isInputRange!Range && is( ElementType!Range == string ) )
{
	auto xyz = input.front.split.to!( long[] );
	return tuple( xyz[ 0 ], xyz[ 1 ], xyz[ 2 ] );
}

auto solve( long x, long y, long z )
{
	return ( x - z ) / ( y + z );
}
