#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=1e5+10;
const int INF=0x3f3f3f3f;
int a,b,c;
char d;
signed main()
{
	cin >> a >> b >> c >> d;
	if(d=='A')cout << a*3600+b*60+c;
	if(d=='P')cout << (a+12)*3600+b*60+c;
	return 0;
}