the Size of struct in Visual Studio 2008 C++

#include "stdafx.h"
struct SS{
	int a;
	int b;
	char c[50];
};
int _tmain(int argc, _TCHAR* argv[])
{
	int sizeA = sizeof(SS);
	int sizeB = sizeof(int)*2+sizeof(char)*50;
}
//
The sizeA = 60 Not 58?
Thank u for your answer