k = int(input())
a, b = map(int, input().split())
y=2023 # 년도
m=1 # 달
d=1 # 일
h=0 #사과의 개수
k-=a+b
while True:
if k<=h:
break
else:
d+=2
h+=a
if k<=h:
break
else:
d+=1
h+=b
if k<=h:
break
else:
d+=1
h+=a
if k<=h:
break
else:
d+=2
h+=(a+b)
if k<=h:
break
else:
continue
d+=2
if d%2==0:
d+=1
else:
d+=2
while(True):
if (m==1 or m==3 or m==5 or m==7 or m==8 or m==10 or m==12) and d>=31:
d-=31
m+=1
elif(m==4 or m==6 or m==9 or m==11) and d>=30:
d-=30
m+=1
elif m==2 and d>=28:
d-=28
m+=1
if((((m==1 or m==3 or m==5 or m==7 or m==8 or m==10 or m==12) and d<=31) or ((m==4 or m==6 or m==9 or m==11) and d<=30) or m==2 and d<=28)):
break
else:
continue
print("%d"%y,"%02d"%m,"%02d"%d,sep='/')