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//Bai 1: ghi n chu so thap phan cua PI
#include <bits/stdc++.h>
int main() {
	int n;
	scanf("%d", &n);
	char s[18] = "3.141592653589793";
	s[n + (!n ? 1 : 2)] = '\0';
	return !printf("%s", s);
}
 
//Bai 2: xac dinh thu cua ngay dd/mm/yyyy
#include <bits/stdc++.h>
const char ans[7][3] = {"CN", "T2", "T3", "T4", "T5", "T6", "T7"};
const int dp[11] = {31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
int main() {
	int d, m, y, cnt;
	scanf("%d%d%d", &d, &m, &y);
	cnt = y * 366 - (y - y / 4) + (y - y / 100) + dp[m - 1] + d;
	cnt += (int)(m > 2 && (y % 4 == 0 || y % 400 == 0 && y % 100 != 0));
	return !printf("%s", ans[cnt % 7]);
}

prog.cpp:15:5: error: redefinition of 'main'
int main() {
    ^
prog.cpp:3:5: note: previous definition is here
int main() {
    ^
prog.cpp:19:52: warning: '&&' within '||' [-Wlogical-op-parentheses]
        cnt += (int)(m > 2 && (y % 4 == 0 || y % 400 == 0 && y % 100 != 0));
                                          ~~ ~~~~~~~~~~~~~^~~~~~~~~~~~~~~
prog.cpp:19:52: note: place parentheses around the '&&' expression to silence this warning
        cnt += (int)(m > 2 && (y % 4 == 0 || y % 400 == 0 && y % 100 != 0));
                                                          ^
                                             (                           )
1 warning and 1 error generated.

Standard output is empty